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Viewing file:     esnext.async-iterator.drop.js (1.6 KB)      -rw-r--r--

'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var call = require('../internals/function-call');
var anObject = require('../internals/an-object');
var getIteratorDirect = require('../internals/get-iterator-direct');
var notANaN = require('../internals/not-a-nan');
var toPositiveInteger = require('../internals/to-positive-integer');
var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
var createIterResultObject = require('../internals/create-iter-result-object');

var AsyncIteratorProxy = createAsyncIteratorProxy(function (Promise) {
  var state = this;

  return new Promise(function (resolve, reject) {
    var doneAndReject = function (error) {
      state.done = true;
      reject(error);
    };

    var loop = function () {
      try {
        Promise.resolve(anObject(call(state.next, state.iterator))).then(function (step) {
          try {
            if (anObject(step).done) {
              state.done = true;
              resolve(createIterResultObject(undefined, true));
            } else if (state.remaining) {
              state.remaining--;
              loop();
            } else resolve(createIterResultObject(step.value, false));
          } catch (err) { doneAndReject(err); }
        }, doneAndReject);
      } catch (error) { doneAndReject(error); }
    };

    loop();
  });
});

$({ target: 'AsyncIterator', proto: true, real: true, forced: true }, {
  drop: function drop(limit) {
    return new AsyncIteratorProxy(getIteratorDirect(this), {
      remaining: toPositiveInteger(notANaN(+limit))
    });
  }
});