TypeScript/src/harness/external/es5compat.js

if (!String.prototype.trim) {
    String.prototype.trim = function () {
        return this.replace(/^\s+|\s+$/g, '');
    };
}

if (!Array.prototype.indexOf) {
    Array.prototype.indexOf = function (searchElement, fromIndex) {
        "use strict";
        if (this == null) {
            throw new TypeError();
        }
        var t = Object(this);
        var len = t.length >>> 0;
        if (len === 0) {
            return -1;
        }
        var n = 0;
        if (arguments.length > 0) {
            n = Number(arguments[1]);
            if (n != n) {
                n = 0;
            } else if (n != 0 && n != Infinity && n != -Infinity) {
                n = (n > 0 || -1) * Math.floor(Math.abs(n));
            }
        }
        if (n >= len) {
            return -1;
        }
        var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
        for (; k < len; k++) {
            if (k in t && t[k] === searchElement) {
                return k;
            }
        }
        return -1;
    };
}

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 = [];
        for (var i = 0; i < len; i++) {
            if (i in t) {
                var val = t[i];
                if (fun.call(thisp, val, i, t))
                    res.push(val);
            }
        }

        return res;
    };
}

if (!Array.prototype.map) {
    Array.prototype.map = function (callback, thisArg) {
        var T = undefined, 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;

        if ({}.toString.call(callback) != "[object Function]") {
            throw new TypeError(callback + " is not a function");
        }

        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;

        while (k < len) {
            var kValue, mappedValue;

            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, : 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) {
        if (this === null || this === undefined)
            throw new TypeError("Object is null or undefined");
        var i = 0, l = this.length >> 0, curr;

        if (typeof accumulator !== "function")
            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];
            i = 1;
        } else
            curr = arguments[1];

        while (i < l) {
            if (i in this)
                curr = accumulator.call(undefined, curr, this[i], i, this);
            ++i;
        }

        return curr;
    };
}

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;

        if ({}.toString.call(callback) != "[object Function]") {
            throw new TypeError(callback + " is not a function");
        }

        if (thisArg) {
            T = thisArg;
        } else {
            T = undefined;
        }

        // 6. Let k be 0
        k = 0;

        while (k < len) {
            var kValue;

            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
    };
}

if (!Date.now) {
    Date.now = function () {
        return (new Date()).getTime();
    };
}

if (!Array.prototype.some) {
    Array.prototype.some = 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++) {
            var idx = i.toString();
            if (idx in t && fun.call(thisp, t[i], i, t))
                return true;
        }

        return false;
    };
}