Merge pull request #258 from diasbruno/feature/array-repeat

feature: added array/repeat.

Author: roboshoes

src/array.js

@@ -38,6 +38,7 @@ return {
     'reject' : require('./array/reject'),
     'remove' : require('./array/remove'),
     'removeAll' : require('./array/removeAll'),
+    'repeat' : require('./array/repeat'),
     'reverse' : require('./array/reverse'),
     'shuffle' : require('./array/shuffle'),
     'slice' : require('./array/slice'),

src/array/repeat.js

@@ -0,0 +1,14 @@
+define(function() {
+
+  /**
+   * Create an array of size N and fill with a value.
+   * This function will throw an exception in case
+   * you pass a negative number.
+   */
+  function repeat(n, value) {
+    var arr = new Array(n);
+    return arr.fill(value);
+  }
+
+  return repeat;
+});

tests/spec/array/spec-repeat.js

@@ -0,0 +1,37 @@
+define(['mout/array/repeat'], function (repeat) {
+
+  describe('array/repeat()', function(){
+
+    it('should create an array of size 0.', function(){
+      expect(repeat(0, 'a')).toEqual([]);
+    });
+
+    it('should create an array of size 1 and fill with null.', function(){
+      expect(repeat(1, null)).toEqual([null]);
+    });
+    
+    it('should create an array of size 1 and fill with a value "a".', function(){
+      expect(repeat(1, 'a')).toEqual(['a']);
+    });
+
+    it('should create an array of size N and fill with a value "a".', function(){
+      expect(repeat(2, 'a')).toEqual(['a', 'a']);
+    });
+
+    it('should create an array of size N and fill with values "albatros".', function(){
+      expect(repeat(2, 'albatros')).toEqual(['albatros', 'albatros']);
+    });
+
+    it('should create an array of size N and fill with a number 1.', function(){
+      expect(repeat(2, 1)).toEqual([1, 1]);
+    });
+
+    it('should create an array of size N and fill with array.', function(){
+      expect(repeat(2, [1])).toEqual([[1], [1]]);
+    });
+
+    it('should throw an exception in case the of a negative number.', function(){
+      expect(() => repeat(-1, null)).toThrow();
+    });
+  });
+});

tests/spec/spec-array.js

@@ -36,6 +36,7 @@ define([
     './array/spec-reject',
     './array/spec-remove',
     './array/spec-removeAll',
+    './array/spec-repeat',
     './array/spec-reverse',
     './array/spec-shuffle',
     './array/spec-slice',