core-js/modules/es6.array.find-index.js

Standard library

'use strict';
// 22.1.3.9 Array.prototype.findIndex(predicate, thisArg = undefined)
var KEY    = 'findIndex'
  , $def   = require('./$.def')
  , forced = true
  , $find  = require('./$.array-methods')(6);
// Shouldn't skip holes
if(KEY in [])Array(1)[KEY](function(){ forced = false; });
$def($def.P + $def.F * forced, 'Array', {
  findIndex: function findIndex(callbackfn/*, that = undefined */){
    return $find(this, callbackfn, arguments[1]);
  }
});
require('./$.unscope')(KEY);