78 lines
1.8 KiB
JavaScript
78 lines
1.8 KiB
JavaScript
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/**
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* Polyfills for very handy methods that are standardized, but not fully implemented in Javascript engines
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*/
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module.exports = (function() {
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if (!Array.prototype.fill) {
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Array.prototype.fill = function(value) {
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// Steps 1-2.
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if (this == null) {
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throw new TypeError('this is null or not defined');
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}
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var O = Object(this);
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// Steps 3-5.
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var len = O.length >>> 0;
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// Steps 6-7.
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var start = arguments[1];
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var relativeStart = start >> 0;
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// Step 8.
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var k = relativeStart < 0 ?
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Math.max(len + relativeStart, 0) :
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Math.min(relativeStart, len);
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// Steps 9-10.
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var end = arguments[2];
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var relativeEnd = end === undefined ?
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len : end >> 0;
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// Step 11.
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var final = relativeEnd < 0 ?
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Math.max(len + relativeEnd, 0) :
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Math.min(relativeEnd, len);
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// Step 12.
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while (k < final) {
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O[k] = value;
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k++;
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}
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// Step 13.
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return O;
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};
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}
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if ( !String.prototype.contains ) {
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String.prototype.contains = function() {
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return String.prototype.indexOf.apply( this, arguments ) !== -1;
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};
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}
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if (!String.prototype.startsWith) {
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Object.defineProperty(String.prototype, 'startsWith', {
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enumerable: false,
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configurable: false,
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writable: false,
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value: function (searchString, position) {
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position = position || 0;
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return this.lastIndexOf(searchString, position) === position;
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}
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});
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}
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if (!String.prototype.endsWith) {
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Object.defineProperty(String.prototype, 'endsWith', {
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value: function (searchString, position) {
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var subjectString = this.toString();
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if (position === undefined || position > subjectString.length) {
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position = subjectString.length;
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}
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position -= searchString.length;
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var lastIndex = subjectString.indexOf(searchString, position);
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return lastIndex !== -1 && lastIndex === position;
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}
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});
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}
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}());
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