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Dir : ~/usr/share/nodejs/core-js-pure/modules/

View File Name : esnext.iterator.filter.js

'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var createIteratorProxy = require('../internals/iterator-create-proxy');
var callWithSafeIterationClosing = require('../internals/call-with-safe-iteration-closing');

var IteratorProxy = createIteratorProxy(function () {
  var iterator = this.iterator;
  var filterer = this.filterer;
  var next = this.next;
  var result, done, value;
  while (true) {
    result = anObject(call(next, iterator));
    done = this.done = !!result.done;
    if (done) return;
    value = result.value;
    if (callWithSafeIterationClosing(iterator, filterer, [value, this.counter++], true)) return value;
  }
});

$({ target: 'Iterator', proto: true, real: true, forced: true }, {
  filter: function filter(filterer) {
    return new IteratorProxy(getIteratorDirect(this), {
      filterer: aCallable(filterer)
    });
  }
});