Merge pull request #1 from yahiaboudah/added-reduce-polyfill-to-array

Create reduce.js

Author: yahiaboudah

Array/reduce.js

@@ -0,0 +1,27 @@
+Array.prototype.reduce = function(callback) {
+  'use strict';
+  if (this == null) {
+    throw new TypeError('Array.prototype.reduce called on null or undefined');
+  }
+  if (typeof callback !== 'function') {
+    throw new TypeError(callback + ' is not a function');
+  }
+  var t = Object(this), len = t.length >>> 0, k = 0, value;
+  if (arguments.length == 2) {
+    value = arguments[1];
+  } else {
+    while (k < len && !(k in t)) {
+      k++; 
+    }
+    if (k >= len) {
+      throw new TypeError('Reduce of empty array with no initial value');
+    }
+    value = t[k++];
+  }
+  for (; k < len; k++) {
+    if (k in t) {
+      value = callback(value, t[k], k, t);
+    }
+  }
+  return value;
+};