node-query/lib/es6-polyfill.js

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2014-10-23 10:53:16 -04:00
/**
* Polyfills for very handy methods that are standardized, but not fully implemented in Javascript engines
*/
module.exports = (function() {
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;
};
}
if ( !String.prototype.contains ) {
String.prototype.contains = function() {
return String.prototype.indexOf.apply( this, arguments ) !== -1;
};
}
if (!String.prototype.startsWith) {
Object.defineProperty(String.prototype, 'startsWith', {
enumerable: false,
configurable: false,
writable: false,
value: function (searchString, position) {
position = position || 0;
return this.lastIndexOf(searchString, position) === position;
}
});
}
if (!String.prototype.endsWith) {
Object.defineProperty(String.prototype, 'endsWith', {
value: function (searchString, position) {
var subjectString = this.toString();
if (position === undefined || position > subjectString.length) {
position = subjectString.length;
}
position -= searchString.length;
var lastIndex = subjectString.indexOf(searchString, position);
return lastIndex !== -1 && lastIndex === position;
}
});
}
}());