debian-mirror-gitlab/core-js/modules/esnext.array.last-index.js

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2019-09-25 13:30:05 +05:30
'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` getter
// https://github.com/keithamus/proposal-array-last
if (DESCRIPTORS && !('lastIndex' in [])) {
defineProperty(Array.prototype, 'lastIndex', {
configurable: true,
get: function lastIndex() {
var O = toObject(this);
var len = toLength(O.length);
return len == 0 ? 0 : len - 1;
}
});
addToUnscopables('lastIndex');
}