datavjs/deps/array_shim.js

// 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;
  };
}
if (!Array.prototype.reduce) {
  Array.prototype.reduce = function reduce(accumulator){
    var i = 0, l = this.length >> 0, curr;
    if(typeof accumulator !== "function") // ES5 : "If IsCallable(callbackfn) is false, throw a TypeError exception."
      throw new TypeError("First argument is not callable");
    if(arguments.length < 2) {
      if (l === 0) throw new TypeError("Array length is 0 and no second argument");
      curr = this[0]; // Increase i to start searching the secondly defined element in the array
      i = 1; // start accumulating at the second element
    }
    else
      curr = arguments[1];
    while (i < l) {
      if(i in this) curr = accumulator.call(undefined, curr, this[i], i, this);
      ++i;
    }
    return curr;
  };
}
// Production steps of ECMA-262, Edition 5, 15.4.4.18
// Reference: http://es5.github.com/#x15.4.4.18
if ( !Array.prototype.forEach ) {
  Array.prototype.forEach = function( callback, thisArg ) {
    var T, 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; // Hack to convert O.length to a UInt32
    // 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 k be 0
    k = 0;
    // 7. Repeat, while k < len
    while( k < len ) {
      var kValue;
      // 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. Call the Call internal method of callback with T as the this value and
        // argument list containing kValue, k, and O.
        callback.call( T, kValue, k, O );
      }
      // d. Increase k by 1.
      k++;
    }
    // 8. return undefined
  };
}
//filter
if (!Array.prototype.filter)
    {
      Array.prototype.filter = function(fun /*, thisp */)
      {
        "use strict";
        if (this == null)
          throw new TypeError();
        var t = Object(this);
        var len = t.length >>> 0;
        if (typeof fun != "function")
          throw new TypeError();
        var res = [];
        var thisp = arguments[1];
        for (var i = 0; i < len; i++)
        {
          if (i in t)
          {
            var val = t[i]; // in case fun mutates this
            if (fun.call(thisp, val, i, t))
              res.push(val);
          }
        }
        return res;
      };
    }
//every
if (!Array.prototype.every)
{
  Array.prototype.every = function(fun /*, thisp */)
  {
    "use strict";
    if (this == null)
      throw new TypeError();
    var t = Object(this);
    var len = t.length >>> 0;
    if (typeof fun != "function")
      throw new TypeError();
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
    {
      if (i in t && !fun.call(thisp, t[i], i, t))
        return false;
    }
    return true;
  };
}