es6.array.index-of.js

'use strict';
var $export       = require('./_export')
  , $indexOf      = require('./_array-includes')(false)
  , $native       = [].indexOf
  , NEGATIVE_ZERO = !!$native && 1 / [1].indexOf(1, -0) < 0;

$export($export.P + $export.F * (NEGATIVE_ZERO || !require('./_strict-method')($native)), 'Array', {
  // 22.1.3.11 / 15.4.4.14 Array.prototype.indexOf(searchElement [, fromIndex])
  indexOf: function indexOf(searchElement /*, fromIndex = 0 */){
    return NEGATIVE_ZERO
      // convert -0 to +0
      ? $native.apply(this, arguments) || 0
      : $indexOf(this, searchElement, arguments[1]);
  }
});