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02-ruby-stdlib.html
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<!DOCTYPE html><html lang="en-US"><head><title>Introducción a Ruby</title><meta property="og:title" content="Introducción a Ruby"><meta name="description" content="Presentanción del lenguaje, parte 2"><meta property="og:description" content="Presentanción del lenguaje, parte 2"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media 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flex: auto;
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article#presentation > svg > foreignObject > section[data-marpit-advanced-background="pseudo"] {
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<h1><svg data-marp-fitting="svg"><foreignObject><span data-marp-fitting-svg-content> Ruby & Standard Library</span></foreignObject></svg></h1>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>Ruby & Standard Library</h1>
<p>Enumerable<br />
CSV, JSON, YAML, Base64<br />
Manejo de excepciones<br />
Módulos<br />
Rake</p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>Enumerable <a href="http://ruby-doc.org/core-2.6.3/Enumerable.html">(docs)</a></h1>
<p><code>Array</code>, <code>Hash</code> y <code>Range</code> incluyen <code>Enumerable</code></p>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>arr = [<span class="hljs-number">121</span>, <span class="hljs-number">4123</span>, <span class="hljs-number">42</span>, <span class="hljs-number">12</span>, <span class="hljs-number">512</span>]
arr.min <span class="hljs-comment"># => 12</span>
arr.max <span class="hljs-comment"># => 4132</span>
arr.minmax <span class="hljs-comment"># => [12, 4132]</span>
arr.count <span class="hljs-comment"># => 5</span>
arr.empty? <span class="hljs-comment"># => false</span>
arr.<span class="hljs-keyword">include</span>?(<span class="hljs-number">10</span>) <span class="hljs-comment"># => false</span>
arr.first <span class="hljs-comment"># => 121</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="4" style="--paginate:true;--theme:gaia;
;">
<h1>Enumerable</h1>
<p><code>Array</code>, <code>Hash</code> y <code>Range</code> incluyen <code>Enumerable</code></p>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>hash = {<span class="hljs-symbol">a:</span> <span class="hljs-string">'uno'</span>, <span class="hljs-symbol">b:</span> <span class="hljs-string">'dos'</span>, <span class="hljs-symbol">c:</span> <span class="hljs-string">'tres'</span>}
hash.keys <span class="hljs-comment"># => [:a, :b, :c]</span>
hash.values <span class="hljs-comment"># => ["uno", "dos", "tres"]</span>
hash.count <span class="hljs-comment"># => 3</span>
hash.first <span class="hljs-comment"># => [:a, "uno"]</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="5" style="--paginate:true;--theme:gaia;
;">
<h1>Enumerable</h1>
<p><code>Array</code>, <code>Hash</code> y <code>Range</code> incluyen <code>Enumerable</code></p>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>arr.each {<span class="hljs-params">|x|</span> puts x+<span class="hljs-number">1</span>} <span class="hljs-comment"># (Imprime 122, 4124, 43, 13, 513)</span>
arr.map {<span class="hljs-params">|x|</span> x+<span class="hljs-number">10</span>} <span class="hljs-comment"># => [131, 4133, 52, 22, 522]</span>
arr.select{<span class="hljs-params">|x|</span> x.odd?} <span class="hljs-comment"># => [121, 4123]</span>
arr.inject(<span class="hljs-number">0</span>) {<span class="hljs-params">|acum, obj|</span> acum+obj} <span class="hljs-comment"># => 4810</span>
</span></span></foreignObject></svg></code></pre>
<p><code>map</code> == <code>collect</code><br />
<code>reduce</code> == <code>inject</code></p>
</section>
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<h1>Ejemplos</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Trio</span></span>
<span class="hljs-keyword">include</span> Enumerable
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">initialize</span> <span class="hljs-title">primero</span>, <span class="hljs-title">segundo</span>, <span class="hljs-title">tercero</span></span>
@primero, @segundo, @tercero = primero, segundo, tercero
<span class="hljs-keyword">end</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">each</span></span>
<span class="hljs-keyword">yield</span> @primero
<span class="hljs-keyword">yield</span> @segundo
<span class="hljs-keyword">yield</span> @tercero
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
soda_stereo = Trio.new <span class="hljs-string">'Gustavo Cerati'</span>, <span class="hljs-string">'Zeta Bosio'</span>, <span class="hljs-string">'Charly Alberti'</span>
soda_stereo.each {<span class="hljs-params">|integrante|</span> puts integrante}
soda_stereo.<span class="hljs-keyword">include</span>? <span class="hljs-string">'Gustavo Cerati'</span> <span class="hljs-comment"># => true</span>
soda_stereo.<span class="hljs-keyword">include</span>? <span class="hljs-string">'Charly García'</span> <span class="hljs-comment"># => false</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">OrdenDeCompra</span></span>
<span class="hljs-keyword">include</span> Enumerable
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">add</span> <span class="hljs-title">item</span></span>
@items <span class="hljs-params">||</span>= []
@items << item
<span class="hljs-keyword">end</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">each</span></span>
@items.each {<span class="hljs-params">|x|</span> <span class="hljs-keyword">yield</span> x}
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
Item = Struct.new(<span class="hljs-symbol">:nombre</span>, <span class="hljs-symbol">:precio</span>)
orden = OrdenDeCompra.new
orden.add(Item.new <span class="hljs-string">'remera'</span>, <span class="hljs-number">500</span>)
orden.add(Item.new <span class="hljs-string">'zapatillas'</span>, <span class="hljs-number">2500</span>)
orden.add(Item.new <span class="hljs-string">'jean'</span>, <span class="hljs-number">2000</span>)
orden.sum{<span class="hljs-params">|item|</span> item.precio } <span class="hljs-comment"># => 5000</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>CSV <a href="http://ruby-doc.org/stdlib-2.6.3/libdoc/csv/rdoc/CSV.html">(docs)</a></h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">require</span> <span class="hljs-string">'csv'</span>
csv = CSV.read(<span class="hljs-string">"beatles.csv"</span>)
<span class="hljs-comment"># [["id", "nombre", "apellido"],</span>
<span class="hljs-comment"># ["1", "John", "Lennon"],</span>
<span class="hljs-comment"># ["2", "Paul", "McCartney"],</span>
<span class="hljs-comment"># ["3", "George", "Harrison"],</span>
<span class="hljs-comment"># ["4", "Ringo", "Starr"]]</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>CSV</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>csv = CSV.read(<span class="hljs-string">"beatles.csv"</span>, <span class="hljs-symbol">headers:</span> <span class="hljs-literal">true</span>)
csv.map{<span class="hljs-params">|row|</span> row[<span class="hljs-string">'nombre'</span>]}.join(<span class="hljs-string">' & '</span>)
<span class="hljs-comment"># => "John & Paul & George & Ringo"</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>CSV</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>csv = CSV.read(<span class="hljs-string">"beatles.csv"</span>,
<span class="hljs-symbol">headers:</span> <span class="hljs-literal">true</span>, <span class="hljs-symbol">header_converters:</span> <span class="hljs-symbol">:symbol</span>)
csv.map{<span class="hljs-params">|row|</span> row[<span class="hljs-symbol">:nombre</span>]}.join(<span class="hljs-string">' & '</span>)
<span class="hljs-comment"># => "John & Paul & George & Ringo"</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="12" style="--paginate:true;--theme:gaia;
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<h1>CSV</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>CSV.foreach(<span class="hljs-string">'beatles.csv'</span>,
<span class="hljs-symbol">headers:</span> <span class="hljs-literal">true</span>,
<span class="hljs-symbol">header_converters:</span> <span class="hljs-symbol">:symbol</span>) <span class="hljs-keyword">do</span> <span class="hljs-params">|row|</span>
puts row[<span class="hljs-symbol">:nombre</span>]
<span class="hljs-keyword">end</span>
<span class="hljs-comment"># John</span>
<span class="hljs-comment"># Paul</span>
<span class="hljs-comment"># George</span>
<span class="hljs-comment"># Ringo</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>CSV</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>CSV.foreach(<span class="hljs-string">'beatles.csv'</span>,
<span class="hljs-symbol">headers:</span> <span class="hljs-literal">true</span>, <span class="hljs-symbol">header_converters:</span> <span class="hljs-symbol">:symbol</span>).
map{<span class="hljs-params">|row|</span> row[<span class="hljs-symbol">:nombre</span>]}
<span class="hljs-comment"># => ["John", "Paul", "George", "Ringo"]</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
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<h1>CSV - Grabar en un archivo</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>CSV.open(<span class="hljs-string">'new_file.csv'</span>, <span class="hljs-string">'w'</span>) <span class="hljs-keyword">do</span> <span class="hljs-params">|file|</span>
file << <span class="hljs-string">%w[id first_name last_name]</span>
users.each <span class="hljs-keyword">do</span> <span class="hljs-params">|user|</span>
file << [user.id, user.first_name, user.last_name]
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="15" style="--paginate:true;--theme:gaia;
;">
<h1>JSON</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">require</span> <span class="hljs-string">'json'</span>
<span class="hljs-comment"># String to Hash</span>
my_hash = JSON.parse(<span class="hljs-string">'{"hello": "goodbye"}'</span>)
puts my_hash[<span class="hljs-string">"hello"</span>] <span class="hljs-comment"># => "goodbye"</span>
<span class="hljs-comment"># Hash to String</span>
my_hash = {<span class="hljs-symbol">:hello</span> => <span class="hljs-string">"goodbye"</span>}
puts JSON.generate(my_hash) <span class="hljs-comment"># => "{\"hello\":\"goodbye\"}"</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="16" style="--paginate:true;--theme:gaia;
;">
<h1>YAML</h1>
<pre><code class="language-yaml"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">---</span>
<span class="hljs-attr">concurrency:</span> <span class="hljs-number">1</span>
<span class="hljs-attr">queues:</span>
<span class="hljs-bullet"> -</span> <span class="hljs-string">default</span>
<span class="hljs-bullet"> -</span> <span class="hljs-string">mailers</span>
<span class="hljs-attr">development:</span>
<span class="hljs-attr"> logfile:</span> <span class="hljs-string">log/sidekiq.log</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="17" style="--paginate:true;--theme:gaia;
;">
<h1>YAML</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">require</span> <span class="hljs-string">'yaml'</span>
<span class="hljs-comment"># Parse a YAML string</span>
YAML.load(<span class="hljs-string">"--- foo"</span>) <span class="hljs-comment">#=> "foo"</span>
<span class="hljs-comment"># Emit some YAML</span>
YAML.dump(<span class="hljs-string">"foo"</span>) <span class="hljs-comment"># => "--- foo\n...\n"</span>
{ <span class="hljs-symbol">:a</span> => <span class="hljs-string">'b'</span>}.to_yaml <span class="hljs-comment"># => "---\n:a: b\n"</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="18" style="--paginate:true;--theme:gaia;
;">
<h1>Base64</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">require</span> <span class="hljs-string">"base64"</span>
encoded = Base64.encode64(<span class="hljs-string">'Secret passphrase'</span>)
<span class="hljs-comment"># => "U2VjcmV0IHBhc3NwaHJhc2U=\n"</span>
plain = Base64.decode64(encoded)
<span class="hljs-comment"># => "Secret passphrase"</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="19" style="--paginate:true;--theme:gaia;
;">
<h2><a href="http://ruby-doc.org/core-2.6.3/doc/globals_rdoc.html">Variables predefinidas</a></h2>
<ul>
<li><code>$_</code> Ultimo valor leído por <code>gets</code></li>
<li><code>$&</code> Ultima coincidencia de una expresión regular</li>
<li><code>$0</code> Nombre del script en ejecución</li>
<li><code>$*</code> Argumentos de línea de comandos con el que se corre el script</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="20" style="--paginate:true;--theme:gaia;
;">
<h2>English <a href="http://ruby-doc.org/stdlib-2.6.3/libdoc/English/rdoc/English.html">(docs)</a></h2>
<ul>
<li><code>$_</code> => <code>$LAST_READ_LINE</code></li>
<li><code>$&</code> => <code>$MATCH</code></li>
<li><code>$0</code> => <code>$PROGRAM_NAME</code></li>
<li><code>$*</code> => <code>$ARGV</code></li>
</ul>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">require</span> <span class="hljs-string">'English'</span>
puts $0 == $PROGRAM_NAME
<span class="hljs-comment"># => true</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="21" style="--paginate:true;--theme:gaia;
;">
<h1>Manejo de excepciones</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>raise <span class="hljs-string">'Ocurrió un error! <img class="emoji" draggable="false" alt="😱" src="https://twemoji.maxcdn.com/2/svg/1f631.svg" data-marp-twemoji=""/>'</span>
<span class="hljs-comment"># Traceback</span>
<span class="hljs-comment"># ...</span>
<span class="hljs-comment"># RuntimeError (Ocurrió un error! <img class="emoji" draggable="false" alt="😱" src="https://twemoji.maxcdn.com/2/svg/1f631.svg" data-marp-twemoji=""/>)</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="22" style="--paginate:true;--theme:gaia;
;">
<h1>Manejo de excepciones</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">begin</span>
<span class="hljs-comment"># ...</span>
<span class="hljs-comment"># codigo</span>
<span class="hljs-comment"># ...</span>
raise <span class="hljs-string">'error message'</span>
<span class="hljs-keyword">rescue</span>
<span class="hljs-comment"># manejo de errores</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="23" style="--paginate:true;--theme:gaia;
;">
<h1>Manejo de excepciones</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-keyword">begin</span>
<span class="hljs-comment"># ... codigo ...</span>
raise <span class="hljs-string">'error message'</span>
<span class="hljs-keyword">rescue</span> ArgumentError => e
puts e.message
<span class="hljs-keyword">rescue</span> RuntimeError => e
puts e.backtrace
<span class="hljs-keyword">rescue</span> e <span class="hljs-comment"># StandardError</span>
puts e.<span class="hljs-keyword">class</span>.name
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-comment"># BAD!</span>
<span class="hljs-keyword">rescue</span> Exception => e
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="24" style="--paginate:true;--theme:gaia;
;">
<h1>Excepciones personalizadas</h1>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">PermissionDeniedError</span> < StandardError</span>
<span class="hljs-keyword">attr_reader</span> <span class="hljs-symbol">:data</span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">initialize</span><span class="hljs-params">(message, data)</span></span>
<span class="hljs-comment"># Call the parent's constructor to set the message</span>
<span class="hljs-keyword">super</span>(message)
@data = data
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
raise PermissionDeniedError.new(<span class="hljs-string">"Permission Denied"</span>, current_user)
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="25" style="--paginate:true;--theme:gaia;
;">
<h1>Módulos</h1>
<ul>
<li>Módulos como namespaces</li>
<li>Composición (mixins)</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="26" style="--paginate:true;--theme:gaia;
;">
<h3>Módulos como Namespaces</h3>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span></span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">hello</span></span>
puts <span class="hljs-string">"Hola, soy "</span> + <span class="hljs-keyword">self</span>.<span class="hljs-keyword">class</span>.name
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
<span class="hljs-class"><span class="hljs-keyword">module</span> <span class="hljs-title">MyApp</span></span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">User</span></span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">hello</span></span>
puts <span class="hljs-string">"Hola, soy "</span> + <span class="hljs-keyword">self</span>.<span class="hljs-keyword">class</span>.name
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
User.new.hello <span class="hljs-comment"># => Hola, soy User</span>
MyApp::User.new.hello <span class="hljs-comment"># => Hola, soy MyApp::User</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="27" style="--paginate:true;--theme:gaia;
;">
<h3>Módulos como Mixins</h3>
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-class"><span class="hljs-keyword">module</span> <span class="hljs-title">Commentable</span></span>
<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">comment</span></span>
<span class="hljs-string">'Esto es un comentario...'</span>
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Post</span></span>
<span class="hljs-keyword">include</span> Commentable
<span class="hljs-keyword">end</span>
<span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">Quote</span></span>
<span class="hljs-keyword">include</span> Commentable
<span class="hljs-keyword">end</span>
Post.new.comment <span class="hljs-comment"># => "Esto es un comentario..."</span>
Quote.new.comment <span class="hljs-comment"># => "Esto es un comentario..."</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="28" style="--paginate:true;--theme:gaia;
;">
<h1>Rake</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="29" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="29" style="--paginate:true;--theme:gaia;
;">
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-comment"># Rakefile</span>
desc <span class="hljs-string">"say hello"</span>
task <span class="hljs-symbol">:hello</span> <span class="hljs-keyword">do</span>
puts <span class="hljs-string">"Hello world"</span>
<span class="hljs-keyword">end</span>
task <span class="hljs-symbol">:bye</span> <span class="hljs-keyword">do</span>
puts <span class="hljs-string">"Goodbye"</span>
<span class="hljs-keyword">end</span>
task <span class="hljs-symbol">default:</span> <span class="hljs-string">'hello'</span>
</span></span></foreignObject></svg></code></pre>
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rake</span>
Hello world
<span class="hljs-meta">
$</span><span class="bash"> rake <span class="hljs-built_in">bye</span></span>
Goodbye
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="30" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="30" style="--paginate:true;--theme:gaia;
;">
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>namespace <span class="hljs-symbol">:reports</span> <span class="hljs-keyword">do</span>
desc <span class="hljs-string">"run monthly report"</span>
task <span class="hljs-symbol">:monthly</span> <span class="hljs-keyword">do</span>
puts <span class="hljs-string">"Sending monthly report..."</span>
<span class="hljs-keyword">end</span>
desc <span class="hljs-string">"generate custom report"</span>
task <span class="hljs-symbol">:user</span>, [<span class="hljs-symbol">:name</span>, <span class="hljs-symbol">:email</span>] <span class="hljs-keyword">do</span> <span class="hljs-params">|task, args|</span>
puts <span class="hljs-string">"work"</span>, args[<span class="hljs-symbol">:email</span>]
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="31" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="31" style="--paginate:true;--theme:gaia;
;">
<pre><code class="language-ruby"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap>namespace <span class="hljs-symbol">:reports</span> <span class="hljs-keyword">do</span>
task <span class="hljs-symbol">:first</span> <span class="hljs-keyword">do</span>; <span class="hljs-keyword">end</span>
task <span class="hljs-symbol">:second</span> <span class="hljs-keyword">do</span>; <span class="hljs-keyword">end</span>
desc <span class="hljs-string">"run monthly report"</span>
task <span class="hljs-symbol">monthly:</span> [<span class="hljs-symbol">:first</span>, <span class="hljs-symbol">:second</span>] <span class="hljs-keyword">do</span>
<span class="hljs-keyword">end</span>
task <span class="hljs-symbol">:user</span>, [<span class="hljs-symbol">:name</span>, <span class="hljs-symbol">:email</span>] <span class="hljs-keyword">do</span> <span class="hljs-params">|task, args|</span>
puts <span class="hljs-string">"work"</span>, args[<span class="hljs-symbol">:email</span>]
<span class="hljs-keyword">end</span>
<span class="hljs-keyword">end</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="32" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="32" style="--paginate:true;--theme:gaia;
;">
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rake reports:monthly</span>
<span class="hljs-meta">$</span><span class="bash"> rake reports:user[joaquin,joaquin@gmail.com]</span>
</span></span></foreignObject></svg></code></pre>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="33" data-paginate="true" data-theme="gaia" data-style="pre code { background: black}
" data-marpit-pagination="33" style="--paginate:true;--theme:gaia;
;">
<pre><code class="language-shell"><svg data-marp-fitting="svg" data-marp-fitting-code><foreignObject><span data-marp-fitting-svg-content><span data-marp-fitting-svg-content-wrap><span class="hljs-meta">$</span><span class="bash"> rake -T</span>
rake hello # say hello
rake reports:monthly # run monthly report
rake reports:user[name,email] # generate custom report
</span></span></foreignObject></svg></code></pre>
</section>
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