kitchensink/examples/node_modules/core-js/modules/$.is-array-iter.js

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// check on default Array iterator
var Iterators  = require('./$.iterators')
  , ITERATOR   = require('./$.wks')('iterator')
  , ArrayProto = Array.prototype;

module.exports = function(it){
  return it !== undefined && (Iterators.Array === it || ArrayProto[ITERATOR] === it);
};