chat-server/qq-imsvr/node_modules/core-js/modules/es6.array.last-index-of.js

'use strict';
var $export       = require('./_export')
  , toIObject     = require('./_to-iobject')
  , toInteger     = require('./_to-integer')
  , toLength      = require('./_to-length')
  , $native       = [].lastIndexOf
  , NEGATIVE_ZERO = !!$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)
      , length = toLength(O.length)
      , 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;
  }
});