lib/es5.js in uglifier-1.0.2 vs lib/es5.js in uglifier-1.0.3

@@ -21,9 +21,84 @@
         fun.call(thisp, t[i], i, t);
     }
   };
 }
 
+// https://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Objects/Array/map
+// Production steps of ECMA-262, Edition 5, 15.4.4.19
+// Reference: http://es5.github.com/#x15.4.4.19
+if (!Array.prototype.map) {
+  Array.prototype.map = function(callback, thisArg) {
+
+    var T, A, k;
+
+    if (this == null) {
+      throw new TypeError(" this is null or not defined");
+    }
+
+    // 1. Let O be the result of calling ToObject passing the |this| value as the argument.
+    var O = Object(this);
+
+    // 2. Let lenValue be the result of calling the Get internal method of O with the argument "length".
+    // 3. Let len be ToUint32(lenValue).
+    var len = O.length >>> 0;
+
+    // 4. If IsCallable(callback) is false, throw a TypeError exception.
+    // See: http://es5.github.com/#x9.11
+    if ({}.toString.call(callback) != "[object Function]") {
+      throw new TypeError(callback + " is not a function");
+    }
+
+    // 5. If thisArg was supplied, let T be thisArg; else let T be undefined.
+    if (thisArg) {
+      T = thisArg;
+    }
+
+    // 6. Let A be a new array created as if by the expression new Array(len) where Array is
+    // the standard built-in constructor with that name and len is the value of len.
+    A = new Array(len);
+
+    // 7. Let k be 0
+    k = 0;
+
+    // 8. Repeat, while k < len
+    while(k < len) {
+
+      var kValue, mappedValue;
+
+      // a. Let Pk be ToString(k).
+      //   This is implicit for LHS operands of the in operator
+      // b. Let kPresent be the result of calling the HasProperty internal method of O with argument Pk.
+      //   This step can be combined with c
+      // c. If kPresent is true, then
+      if (k in O) {
+
+        // i. Let kValue be the result of calling the Get internal method of O with argument Pk.
+        kValue = O[ k ];
+
+        // ii. Let mappedValue be the result of calling the Call internal method of callback
+        // with T as the this value and argument list containing kValue, k, and O.
+        mappedValue = callback.call(T, kValue, k, O);
+
+        // iii. Call the DefineOwnProperty internal method of A with arguments
+        // Pk, Property Descriptor {Value: mappedValue, Writable: true, Enumerable: true, Configurable: true},
+        // and false.
+
+        // In browsers that support Object.defineProperty, use the following:
+        // Object.defineProperty(A, Pk, { value: mappedValue, writable: true, enumerable: true, configurable: true });
+
+        // For best browser support, use the following:
+        A[ k ] = mappedValue;
+      }
+      // d. Increase k by 1.
+      k++;
+    }
+
+    // 9. return A
+    return A;
+  };
+}
+
 // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/Reduce
 
 if (!Array.prototype.reduce)
 {
   Array.prototype.reduce = function(fun /*, initialValue */)
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