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string.js
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46 lines (42 loc) · 1.17 KB
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// String.startsWith polyfill
if (! String.prototype.startsWith) {
Object.defineProperty(String.prototype, 'startsWith', {
enumerable: false,
configurable: true,
writable: true,
value: function(str) {
var that = this;
for(var i = 0, ceil = str.length; i < ceil; i++)
if(that[i] !== str[i]) return false;
return true;
}
});
}
// String.endsWith polyfill
if (! String.prototype.endsWith) {
Object.defineProperty(String.prototype, 'endsWith', {
enumerable: false,
configurable: true,
writable: true,
value: function(str) {
var that = this;
for(var i = 0, ceil = str.length; i < ceil; i++)
if (that[i + that.length - ceil] !== str[i])
return false;
return true;
}
});
}
if (!String.prototype.includes) {
String.prototype.includes = function(search, start) {
'use strict';
if (typeof start !== 'number') {
start = 0;
}
if (start + search.length > this.length) {
return false;
} else {
return this.indexOf(search, start) !== -1;
}
};
}