debian-mirror-gitlab/core-js/modules/esnext.array.last-item.js
2019-09-25 13:30:05 +05:30

26 lines
863 B
JavaScript

'use strict';
var DESCRIPTORS = require('../internals/descriptors');
var addToUnscopables = require('../internals/add-to-unscopables');
var toObject = require('../internals/to-object');
var toLength = require('../internals/to-length');
var defineProperty = require('../internals/object-define-property').f;
// `Array.prototype.lastIndex` accessor
// https://github.com/keithamus/proposal-array-last
if (DESCRIPTORS && !('lastItem' in [])) {
defineProperty(Array.prototype, 'lastItem', {
configurable: true,
get: function lastItem() {
var O = toObject(this);
var len = toLength(O.length);
return len == 0 ? undefined : O[len - 1];
},
set: function lastItem(value) {
var O = toObject(this);
var len = toLength(O.length);
return O[len == 0 ? 0 : len - 1] = value;
}
});
addToUnscopables('lastItem');
}