Edit File: es6.array.last-index-of.js
'use strict'; var $export = require('./_export'); var toIObject = require('./_to-iobject'); var toInteger = require('./_to-integer'); var toLength = require('./_to-length'); var $native = [].lastIndexOf; var NEGATIVE_ZERO = !!$native && 1 / [1].lastIndexOf(1, -0) < 0; $export($export.P + $export.F * (NEGATIVE_ZERO || !require('./_strict-method')($native)), 'Array', { // 22.1.3.14 / 15.4.4.15 Array.prototype.lastIndexOf(searchElement [, fromIndex]) lastIndexOf: function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) { // convert -0 to +0 if (NEGATIVE_ZERO) return $native.apply(this, arguments) || 0; var O = toIObject(this); var length = toLength(O.length); var index = length - 1; if (arguments.length > 1) index = Math.min(index, toInteger(arguments[1])); if (index < 0) index = length + index; for (;index >= 0; index--) if (index in O) if (O[index] === searchElement) return index || 0; return -1; } });
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