81 lines
2.3 KiB
JavaScript
81 lines
2.3 KiB
JavaScript
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'use strict';
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// Polyfills for (old) mobile browsers and IE 11
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// From https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/
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if (!String.prototype.includes) {
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String.prototype.includes = 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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String.prototype.startsWith = function (searchString, position) {
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position = position || 0;
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return this.substr(position, searchString.length) === searchString;
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};
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}
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if (!String.prototype.repeat) {
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String.prototype.repeat = function (count) {
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'use strict';
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if (this === null) {
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throw new TypeError('can\'t convert ' + this + ' to object');
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}
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var str = '' + this;
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count = +count;
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if (count < 0) {
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throw new RangeError('repeat count must be non-negative');
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}
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if (count === Infinity) {
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throw new RangeError('repeat count must be less than infinity');
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}
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count = Math.floor(count);
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if (str.length === 0 || count === 0) {
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return '';
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}
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// Ensuring count is a 31-bit integer allows us to heavily optimize the
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// main part. But anyway, most current (August 2014) browsers can't handle
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// strings 1 << 28 chars or longer, so:
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if (str.length * count >= 1 << 28) {
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throw new RangeError('repeat count must not overflow maximum string size');
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}
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var rpt = '';
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for (; ;) {
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if ((count & 1) === 1) {
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rpt += str;
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}
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count >>>= 1;
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if (count === 0) {
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break;
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}
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str += str;
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}
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// Could we try:
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// return Array(count + 1).join(this);
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return rpt;
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};
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}
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if (typeof Object.assign !== 'function') {
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Object.assign = function(target, varArgs) { // .length of function is 2
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if (target == null) { // TypeError if undefined or null
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throw new TypeError('Cannot convert undefined or null to object');
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}
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var to = Object(target);
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for (var index = 1; index < arguments.length; index++) {
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var nextSource = arguments[index];
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if (nextSource != null) { // Skip over if undefined or null
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for (var nextKey in nextSource) {
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// Avoid bugs when hasOwnProperty is shadowed
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if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
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to[nextKey] = nextSource[nextKey];
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}
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}
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}
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}
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return to;
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};
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}
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