forerunnerdb/js/lib/Shim.IE8.js

A NoSQL document store database for browsers and Node.js.

/* jshint strict:false */
if (!Array.prototype.filter) {
	Array.prototype.filter = function(fun/*, thisArg*/) {

		if (this === void 0 || this === null) {
			throw new TypeError();
		}

		var t = Object(this);
		var len = t.length >>> 0; // jshint ignore:line
		if (typeof fun !== 'function') {
			throw new TypeError();
		}

		var res = [];
		var thisArg = arguments.length >= 2 ? arguments[1] : void 0;
		for (var i = 0; i < len; i++) {
			if (i in t) {
				var val = t[i];

				// NOTE: Technically this should Object.defineProperty at
				//       the next index, as push can be affected by
				//       properties on Object.prototype and Array.prototype.
				//       But that method's new, and collisions should be
				//       rare, so use the more-compatible alternative.
				if (fun.call(thisArg, val, i, t)) {
					res.push(val);
				}
			}
		}

		return res;
	};
}

if (typeof Object.create !== 'function') {
	Object.create = (function() {
		var Temp = function() {};
		return function (prototype) {
			if (arguments.length > 1) {
				throw Error('Second argument not supported');
			}
			if (typeof prototype !== 'object') {
				throw TypeError('Argument must be an object');
			}
			Temp.prototype = prototype;
			var result = new Temp();
			Temp.prototype = null;
			return result;
		};
	})();
}

// Production steps of ECMA-262, Edition 5, 15.4.4.14
// Reference: http://es5.github.io/#x15.4.4.14e
if (!Array.prototype.indexOf) {
	Array.prototype.indexOf = function(searchElement, fromIndex) {
		var k;

		// 1. Let O be the result of calling ToObject passing
		//    the this value as the argument.
		if (this === null) {
			throw new TypeError('"this" is null or not defined');
		}

		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; // jshint ignore:line

		// 4. If len is 0, return -1.
		if (len === 0) {
			return -1;
		}

		// 5. If argument fromIndex was passed let n be
		//    ToInteger(fromIndex); else let n be 0.
		var n = +fromIndex || 0;

		if (Math.abs(n) === Infinity) {
			n = 0;
		}

		// 6. If n >= len, return -1.
		if (n >= len) {
			return -1;
		}

		// 7. If n >= 0, then Let k be n.
		// 8. Else, n<0, Let k be len - abs(n).
		//    If k is less than 0, then let k be 0.
		k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);

		// 9. Repeat, while k < len
		while (k < len) {
			// 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
			//    i.  Let elementK be the result of calling the Get
			//        internal method of O with the argument ToString(k).
			//   ii.  Let same be the result of applying the
			//        Strict Equality Comparison Algorithm to
			//        searchElement and elementK.
			//  iii.  If same is true, return k.
			if (k in O && O[k] === searchElement) {
				return k;
			}
			k++;
		}
		return -1;
	};
}

module.exports = {};