diff --git a/docs/_static/custom.css b/docs/_static/custom.css
new file mode 100644
index 000000000..8852b0a42
--- /dev/null
+++ b/docs/_static/custom.css
@@ -0,0 +1,16 @@
+.row-even .line-block, .row-odd .line-block {
+  margin-left: 0;
+}
+
+.versionmodified {
+  font-weight: bold;
+}
+
+.wy-menu-vertical p.caption {
+  color: #b3b3b3;
+  margin-top: 16px;
+  margin-bottom: 0;
+}
+.wy-menu-vertical p.caption .caption-text {
+  font-size: 120%;
+}
\ No newline at end of file
diff --git a/docs/_static/highlight.css b/docs/_static/highlight.css
new file mode 100644
index 000000000..5dc9865ed
--- /dev/null
+++ b/docs/_static/highlight.css
@@ -0,0 +1,59 @@
+div.highlight {
+  background-color: #343131 !important;
+}
+
+div.highlight pre {
+  border: none;
+  color: white !important;
+}
+
+div.highlight pre span.n,
+div.highlight pre span.na,
+div.highlight pre span.nb,
+div.highlight pre span.nc,
+div.highlight pre span.nf,
+div.highlight pre span.nx,
+div.highlight pre span.kn {
+  color: white;
+}
+
+div.highlight pre span.nv {
+  color: #6ab0de
+}
+
+div.highlight pre span.k, div.highlight pre span.o {
+  color: #ff8400;
+}
+
+div.highlight pre span.mi,
+div.highlight pre span.s,
+div.highlight pre span.s1,
+div.highlight pre span.s2,
+div.highlight pre span.sr {
+  color: #56db3a;
+}
+
+div.highlight pre span.hll {
+  background-color: #848484;
+}
+
+div.highlight pre span.hll span.c1 {
+  color: #d8d8d8;
+}
+
+div.highlight pre span.p {
+  color: #b3b3b3;
+}
+
+table.highlighttable td {
+  padding: 0;
+}
+
+table.highlighttable td div.linenodiv {
+  text-align: right;
+  width: 38px;
+}
+
+div.highlight-json pre span.nt {
+  color: cornsilk;
+}
\ No newline at end of file
diff --git a/docs/assets/img/psrcas-logo.png b/docs/assets/img/psrcas-logo.png
new file mode 100644
index 000000000..9572c16c8
Binary files /dev/null and b/docs/assets/img/psrcas-logo.png differ
diff --git a/docs/conf.py b/docs/conf.py
new file mode 100644
index 000000000..25ffb42ce
--- /dev/null
+++ b/docs/conf.py
@@ -0,0 +1,295 @@
+# -*- coding: utf-8 -*-
+#
+# This file is execfile()d with the current directory set to its
+# containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import sys
+import os
+import shlex
+from sphinx.highlighting import lexers
+from pygments.lexers.web import PhpLexer
+
+lexers['php'] = PhpLexer(startinline=True, linenos=1)
+
+primary_domain = 'php'
+highlight_language = 'php'
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+#sys.path.insert(0, os.path.abspath('.'))
+
+# -- General configuration ------------------------------------------------
+
+# Warnings
+suppress_warnings = ["image.nonlocal_uri"]
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#needs_sphinx = '1.0'
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The encoding of source files.
+#source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = u'Collection'
+copyright = u'2019, Pol Dellaiera'
+author = u'Pol Dellaiera'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = u'1.0.0'
+# The full version, including alpha/beta/rc tags.
+release = u'1.0.0'
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#today = ''
+# Else, today_fmt is used as the format for a strftime call.
+#today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+exclude_patterns = ['_build']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+#modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+#keep_warnings = False
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
+if not on_rtd:  # only import and set the theme if we're building docs locally
+    import sphinx_rtd_theme
+    html_theme = 'sphinx_rtd_theme'
+    html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+#html_theme_path = []
+
+# The name for this set of Sphinx documents.  If None, it defaults to
+# "<project> v<release> documentation".
+#html_title = None
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#html_logo = None
+
+# The name of an image file (within the static path) to use as favicon of the
+# docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+html_favicon = 'favicon.ico'
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#html_extra_path = []
+
+# If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
+# using the given strftime format.
+#html_last_updated_fmt = '%b %d, %Y'
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#html_use_smartypants = True
+
+
+def setup(app):
+    app.add_stylesheet('custom.css')
+    app.add_stylesheet('highlight.css')
+
+# Custom sidebar templates, maps document names to template names.
+#html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#html_additional_pages = {}
+
+# If false, no module index is generated.
+#html_domain_indices = True
+
+# If false, no index is generated.
+#html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+#html_file_suffix = None
+
+# Language to be used for generating the HTML full-text search index.
+# Sphinx supports the following languages:
+#   'da', 'de', 'en', 'es', 'fi', 'fr', 'hu', 'it', 'ja'
+#   'nl', 'no', 'pt', 'ro', 'ru', 'sv', 'tr'
+#html_search_language = 'en'
+
+# A dictionary with options for the search language support, empty by default.
+# Now only 'ja' uses this config value
+#html_search_options = {'type': 'default'}
+
+# The name of a javascript file (relative to the configuration directory) that
+# implements a search results scorer. If empty, the default will be used.
+#html_search_scorer = 'scorer.js'
+
+# Output file base name for HTML help builder.
+htmlhelp_basename = 'CollectionDoc'
+
+# -- Options for LaTeX output ---------------------------------------------
+
+latex_elements = {
+# The paper size ('letterpaper' or 'a4paper').
+#'papersize': 'letterpaper',
+
+# The font size ('10pt', '11pt' or '12pt').
+#'pointsize': '10pt',
+
+# Additional stuff for the LaTeX preamble.
+#'preamble': '',
+
+# Latex figure (float) alignment
+#'figure_align': 'htbp',
+}
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title,
+#  author, documentclass [howto, manual, or own class]).
+latex_documents = [
+  (master_doc, 'drupol-collection-documentation.tex', u'drupol/collection Documentation',
+   u'Pol Dellaiera', 'manual'),
+]
+
+# The name of an image file (relative to this directory) to place at the top of
+# the title page.
+#latex_logo = None
+
+# For "manual" documents, if this is true, then toplevel headings are parts,
+# not chapters.
+#latex_use_parts = False
+
+# If true, show page references after internal links.
+#latex_show_pagerefs = False
+
+# If true, show URL addresses after external links.
+#latex_show_urls = False
+
+# Documents to append as an appendix to all manuals.
+#latex_appendices = []
+
+# If false, no module index is generated.
+#latex_domain_indices = True
+
+
+# -- Options for manual page output ---------------------------------------
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    (master_doc, 'drupol-collection', u'Collection Documentation',
+     [author], 1)
+]
+
+# If true, show URL addresses after external links.
+#man_show_urls = False
+
+
+# -- Options for Texinfo output -------------------------------------------
+
+# Grouping the document tree into Texinfo files. List of tuples
+# (source start file, target name, title, author,
+#  dir menu entry, description, category)
+texinfo_documents = [
+  (master_doc, 'drupol-collection', u'Drupol/Collection Documentation',
+   author, 'Collection', 'One line description of project.',
+   'Miscellaneous'),
+]
+
+# Documents to append as an appendix to all manuals.
+#texinfo_appendices = []
+
+# If false, no module index is generated.
+#texinfo_domain_indices = True
+
+# How to display URL addresses: 'footnote', 'no', or 'inline'.
+#texinfo_show_urls = 'footnote'
+
+# If true, do not generate a @detailmenu in the "Top" node's menu.
+#texinfo_no_detailmenu = False
+
+
diff --git a/docs/index.rst b/docs/index.rst
new file mode 100644
index 000000000..b0754c37f
--- /dev/null
+++ b/docs/index.rst
@@ -0,0 +1,62 @@
+Collection
+==========
+
+Collection is a functional utility library for PHP.
+
+It's similar to `other available collection libraries`_ based on regular PHP arrays,
+but with a lazy mechanism under the hood that strives to do as little work as possible while being as flexible
+as possible.
+
+Collection leverages PHP's generators and iterators to allow you to work with very large data sets while keeping memory
+usage as low as possible.
+
+For example, imagine your application needs to process a multi-gigabyte log file while taking advantage of this
+library's methods to parse the logs.
+Instead of reading the entire file into memory at once, this library may be used to keep only a small part of the file
+in memory at a given time.
+
+On top of this, this library:
+ * is `immutable`_,
+ * is extendable,
+ * leverages the power of PHP `generators`_ and `iterators`_,
+ * uses `S.O.L.I.D. principles`_,
+ * doesn't depends or require any other library or framework.
+
+Except a few methods, most of methods are `pure`_ and return a new Collection object.
+
+This library has been inspired by the `Laravel Support Package`_ and `Lazy.js`_.
+
+It uses the following `PHP Standards Recommendations`_ :
+
+-  `PSR-4`_ for classes autoloading,
+-  `PSR-12`_ for coding standards,
+
+This library is framework agnostic and can be integrated in any PHP project, in any framework.
+
+.. _Lazy.js: http://danieltao.com/lazy.js/
+.. _Laravel Support Package: https://github.com/illuminate/support
+.. _pure: https://en.wikipedia.org/wiki/Pure_function
+.. _S.O.L.I.D. principles: https://en.wikipedia.org/wiki/SOLID
+.. _iterators: https://www.php.net/manual/en/class.iterator.php
+.. _generators: https://www.php.net/manual/en/class.generator.php
+.. _immutable: https://en.wikipedia.org/wiki/Immutable_object
+.. _other available collection libraries: https://packagist.org/?query=collection
+.. _PHP Standards Recommendations: https://www.php-fig.org/
+.. _PSR-4: https://www.php-fig.org/psr/psr-4/
+.. _PSR-12: https://www.php-fig.org/psr/psr-12/
+
+.. toctree::
+    :hidden:
+
+    Collection <self>
+
+.. toctree::
+   :hidden:
+   :caption: Table of Contents
+
+   Requirements <pages/requirements>
+   Installation <pages/installation>
+   Usage <pages/usage>
+   Tests <pages/tests>
+   Contributing <pages/contributing>
+   Development <pages/development>
diff --git a/docs/pages/contributing.rst b/docs/pages/contributing.rst
new file mode 100644
index 000000000..d855f546a
--- /dev/null
+++ b/docs/pages/contributing.rst
@@ -0,0 +1,7 @@
+Contributing
+============
+
+See the file `CONTRIBUTING.md`_ but feel free to contribute to this
+library by sending Github pull requests.
+
+.. _CONTRIBUTING.md: .github/CONTRIBUTING.md
diff --git a/docs/pages/development.rst b/docs/pages/development.rst
new file mode 100644
index 000000000..ba67c43f5
--- /dev/null
+++ b/docs/pages/development.rst
@@ -0,0 +1,4 @@
+.. _development:
+
+Development
+===========
diff --git a/docs/pages/installation.rst b/docs/pages/installation.rst
new file mode 100644
index 000000000..f90b15924
--- /dev/null
+++ b/docs/pages/installation.rst
@@ -0,0 +1,10 @@
+Installation
+============
+
+The easiest way to install it is through Composer_
+
+.. code-block:: bash
+
+    composer require drupol/collection
+
+.. _Composer: https://getcomposer.org
\ No newline at end of file
diff --git a/docs/pages/requirements.rst b/docs/pages/requirements.rst
new file mode 100644
index 000000000..256320208
--- /dev/null
+++ b/docs/pages/requirements.rst
@@ -0,0 +1,8 @@
+Requirements
+============
+
+PHP
+---
+
+PHP greater than 7.1 is required for this library.
+
diff --git a/docs/pages/tests.rst b/docs/pages/tests.rst
new file mode 100644
index 000000000..569e2644b
--- /dev/null
+++ b/docs/pages/tests.rst
@@ -0,0 +1,58 @@
+Tests, code quality and code style
+==================================
+
+Every time changes are introduced into the library, `Github Actions`_
+run the tests.
+
+Tests are written with `PHPSpec`_.
+
+`PHPInfection`_ is also triggered used to ensure that your code is properly
+tested.
+
+The code style is based on `PSR-12`_ plus a set of custom rules.
+Find more about the code style in use in the package `drupol/php-conventions`_.
+
+A PHP quality tool, Grumphp_, is used to orchestrate all these tasks at each commit
+on the local machine, but also on the continuous integration tools.
+
+To run the whole tests tasks locally, do
+
+.. code-block:: bash
+
+    composer grumphp
+
+or
+
+.. code-block:: bash
+
+    ./vendor/bin/grumphp run
+
+Here's an example of output that shows all the tasks that are setup in Grumphp and that
+will check your code
+
+.. code-block:: bash
+
+    $ ./vendor/bin/grumphp run
+    GrumPHP is sniffing your code!
+    Running task  1/13: SecurityChecker... ✔
+    Running task  2/13: Composer... ✔
+    Running task  3/13: ComposerNormalize... ✔
+    Running task  4/13: YamlLint... ✔
+    Running task  5/13: JsonLint... ✔
+    Running task  6/13: PhpLint... ✔
+    Running task  7/13: TwigCs... ✔
+    Running task  8/13: PhpCsAutoFixerV2... ✔
+    Running task  9/13: PhpCsFixerV2... ✔
+    Running task 10/13: Phpcs... ✔
+    Running task 11/13: PhpStan... ✔
+    Running task 12/13: Phpspec... ✔
+    Running task 13/13: Infection... ✔
+    $
+
+
+.. _PSR-12: https://www.php-fig.org/psr/psr-12/
+.. _drupol/php-conventions: https://github.com/drupol/php-conventions
+.. _Github Actions: https://github.com/drupol/collection/actions
+.. _PHPSpec: http://www.phpspec.net/
+.. _PHPInfection: https://github.com/infection/infection
+.. _Grumphp: https://github.com/phpro/grumphp
\ No newline at end of file
diff --git a/docs/pages/usage.rst b/docs/pages/usage.rst
new file mode 100644
index 000000000..17801490c
--- /dev/null
+++ b/docs/pages/usage.rst
@@ -0,0 +1,272 @@
+Usage
+=====
+
+.. code-block:: php
+
+    <?php
+
+    declare(strict_types=1);
+
+    include 'vendor/autoload.php';
+
+    use drupol\collection\Collection;
+
+    // More examples...
+    $collection = Collection::with(['A', 'B', 'C', 'D', 'E']);
+
+    // Get the result as an array.
+    $collection
+        ->all(); // ['A', 'B', 'C', 'D', 'E']
+
+    // Get the first item.
+    $collection
+        ->first(); // A
+
+    // Append items.
+    $collection
+        ->append('F', 'G', 'H')
+        ->all(); // ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H']
+
+    // Prepend items.
+    $collection
+        ->prepend('1', '2', '3')
+        ->all(); // ['1', '2', '3', 'A', 'B', 'C', 'D', 'E']
+
+    // Split a collection into chunks of a given size.
+    $collection
+        ->chunk(2)
+        ->map(static function (Collection $collection) {return $collection->all();})
+        ->all(); // [['A', 'B'], ['C', 'D'], ['E']]
+
+    // Merge items.
+    $collection
+        ->merge([1, 2], [3, 4], [5, 6])
+        ->all(); // ['A', 'B', 'C', 'D', 'E', 1, 2, 3, 4, 5, 6]
+
+    // Map data
+    $collection
+        ->map(
+            static function ($value, $key) {
+                return sprintf('%s.%s', $value, $value);
+            }
+        )
+        ->all(); // ['A.A', 'B.B', 'C.C', 'D.D', 'E.E']
+
+    // ::map() and ::walk() are not the same.
+    Collection::with(['A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E'])
+        ->map(
+            static function ($value, $key) {
+                return strtolower($value);
+            }
+        )
+        ->all(); // [0 => 'a', 1 => 'b', 2 => 'c', 3 = >'d', 4 => 'e']
+
+    Collection::with(['A' => 'A', 'B' => 'B', 'C' => 'C', 'D' => 'D', 'E' => 'E'])
+        ->walk(
+            static function ($value, $key) {
+                return strtolower($value);
+            }
+        )
+        ->all(); // ['A' => 'a', B => 'b', 'C' => 'c', 'D' = >'d', 'E' => 'e']
+
+    // Tail
+    Collection::with(range('a', 'z'))
+        ->tail(3)
+        ->all(); // [23 => 'x', 24 => 'y', 25 => 'z']
+
+    // Reverse
+    Collection::with(range('a', 'z'))
+        ->tail(4)
+        ->reverse()
+        ->all(); // [25 => 'z', 24 => 'y', 23 => 'x', 22 => 'w']
+
+    // Flip operation.
+    // array_flip() can be used in PHP to remove duplicates from an array.(dedup-licate an array)
+    // See: https://www.php.net/manual/en/function.array-flip.php
+    // Example:
+    // $dedupArray = array_flip(array_flip(['a', 'b', 'c', 'd', 'a'])); // ['a', 'b', 'c', 'd']
+    // However, in drupol/collection it doesn't behave as such.
+    // As this library is based on PHP Generators, it's able to return multiple times the same key when iterating.
+    // You end up with the following result when issuing twice the ::flip() operation.
+    Collection::with(['a', 'b', 'c', 'd', 'a'])
+        ->flip()
+        ->flip()
+        ->all(); // ['a', 'b', 'c', 'd', 'a']
+
+    // Infinitely loop over numbers, cube them, filter those that are not divisible by 5, take the first 100 of them.
+    Collection::range(0, INF)
+        ->map(
+            static function ($value, $key) {
+                return $value ** 3;
+            }
+        )
+        ->filter(
+            static function ($value, $key) {
+                return $value % 5;
+            }
+        )
+        ->limit(100)
+        ->all(); // [1, 8, 27, ..., 1815848, 1860867, 1906624]
+
+    // Apply a callback to the values without altering the original object.
+    // If the callback returns false, then it will stop.
+    Collection::with(range('A', 'Z'))
+        ->apply(
+            static function ($value, $key) {
+                echo strtolower($value);
+            }
+        );
+
+    // Generate 300 distinct random numbers between 0 and 1000
+    $random = static function() {
+        return mt_rand() / mt_getrandmax();
+    };
+
+    Collection::iterate($random)
+        ->map(
+            static function ($value) {
+                return floor($value * 1000) + 1;
+            }
+        )
+        ->distinct()
+        ->limit(300)
+        ->normalize()
+        ->all();
+
+    // The famous Fibonacci example:
+    Collection::with(
+            static function($start = 0, $inc = 1) {
+                yield $start;
+
+                while(true)
+                {
+                    $inc = $start + $inc;
+                    $start = $inc - $start;
+                    yield $start;
+                }
+            }
+        )
+        ->limit(10)
+        ->all(); // [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
+
+    // Fibonacci using the static method ::iterate()
+    Collection::iterate(
+        static function($previous, $next) {
+            return [$next, $previous + $next];
+        },
+        1,1
+        )
+        // Get the first item of each result.
+        ->pluck(0)
+        // Limit the amount of results to 10.
+        ->limit(10)
+        // Convert to regular array.
+        ->all(); // [1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
+
+    // Find the Golden Ratio with Fibonacci
+    $fibonacci = Collection::iterate(
+        static function($previous, $next) {
+            return [$next, $previous + $next];
+        },
+        1,1
+        );
+
+    Collection::with($fibonacci)
+        ->map(
+            static function(array $value, $key) {
+                [$previous, $next] = $value;
+
+                return $next / $previous;
+            }
+        )
+        ->limit(100)
+        ->last(); // 1.6180339887499
+
+    // Use an existing Generator as input data.
+    $readFileLineByLine = static function (string $filepath): Generator {
+        $fh = \fopen($filepath, 'rb');
+
+        while (false !== $line = fgets($fh)) {
+            yield $line;
+        }
+
+        \fclose($fh);
+    };
+
+    $hugeFile = __DIR__ . '/vendor/composer/autoload_static.php';
+
+    Collection::with($readFileLineByLine($hugeFile))
+        // Add the line number at the end of the line, as comment.
+        ->map(
+            static function ($value, $key) {
+                return str_replace(PHP_EOL, ' // line ' . $key . PHP_EOL, $value);
+            }
+        )
+        // Find public static fields or methods among the results.
+        ->filter(
+            static function ($value, $key) {
+                return false !== strpos(trim($value), 'public static');
+            }
+        )
+        // Skip the first result.
+        ->skip(1)
+        // Limit to 3 results only.
+        ->limit(3)
+        // Implode into a string.
+        ->implode();
+
+    // Load a string
+    $string = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+      Quisque feugiat tincidunt sodales.
+      Donec ut laoreet lectus, quis mollis nisl.
+      Aliquam maximus, orci vel placerat dapibus, libero erat aliquet nibh, nec imperdiet felis dui quis est.
+      Vestibulum non ante sit amet neque tincidunt porta et sit amet neque.
+      In a tempor ipsum. Duis scelerisque libero sit amet enim pretium pulvinar.
+      Duis vitae lorem convallis, egestas mauris at, sollicitudin sem.
+      Fusce molestie rutrum faucibus.';
+
+    // By default will have the same behavior as str_split().
+    Collection::with($string)
+        ->explode(' ')
+        ->count(); // 71
+
+    // Or add a separator if needed, same behavior as explode().
+    Collection::with($string, ',')
+      ->count(); // 9
+
+    // The Collatz conjecture (https://en.wikipedia.org/wiki/Collatz_conjecture)
+    $collatz = static function (int $value): int
+    {
+        return 0 === $value % 2 ?
+            $value / 2:
+            $value * 3 + 1;
+    };
+
+    Collection::iterate($collatz, 10)
+        ->until(static function ($number): bool {
+            return 1 === $number;
+        })
+        ->all(); // [5, 16, 8, 4, 2, 1]
+
+    // Regular values normalization.
+    Collection::with([0, 2, 4, 6, 8, 10])
+        ->scale(0, 10)
+        ->all(); // [0, 0.2, 0.4, 0.6, 0.8, 1]
+
+    // Logarithmic values normalization.
+    Collection::with([0, 2, 4, 6, 8, 10])
+        ->scale(0, 10, 5, 15, 3)
+        ->all(); // [5, 8.01, 11.02, 12.78, 14.03, 15]
+
+    // Fun with function convergence.
+    // Iterator over the function: f(x) = r * x * (1-x)
+    // Change that parameter $r to see different behavior.
+    // More on this: https://en.wikipedia.org/wiki/Logistic_map
+    $function = static function ($x = .3, $r = 2) {
+        return $r * $x * (1 - $x);
+    };
+
+    Collection::iterate($function)
+        ->map(static function ($value) {return round($value,2);})
+        ->limit(10)
+        ->all(); // [0.42, 0.48, 0.49, 0.49, 0.5, 0.5, 0.5, 0.5, 0.5, 0.5]