feeles-ide/samples/mc/lib/polyfill.js

The hackable and serializable IDE to make learning material

if (!Math.sign) {
	Math.sign = function(x) {
		x = +x; // convert to a number
		if (x === 0 || isNaN(x)) {
			return x;
		}
		return x > 0 ? 1 : -1;
	};
}

if (!Array.prototype.fill) {
	Array.prototype.fill = function(value) {

		// Steps 1-2.
		if (this == null) {
			throw new TypeError('this is null or not defined');
		}

		var O = Object(this);

		// Steps 3-5.
		var len = O.length >>> 0;

		// Steps 6-7.
		var start = arguments[1];
		var relativeStart = start >> 0;

		// Step 8.
		var k = relativeStart < 0 ?
			Math.max(len + relativeStart, 0) :
			Math.min(relativeStart, len);

		// Steps 9-10.
		var end = arguments[2];
		var relativeEnd = end === undefined ?
			len : end >> 0;

		// Step 11.
		var final = relativeEnd < 0 ?
			Math.max(len + relativeEnd, 0) :
			Math.min(relativeEnd, len);

		// Step 12.
		while (k < final) {
			O[k] = value;
			k++;
		}

		// Step 13.
		return O;
	};
}