main
Last change
on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
Initial commit
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File size:
1.2 KB
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[d24f17c] | 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var call = require('../internals/function-call');
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| 4 | var anObject = require('../internals/an-object');
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| 5 | var getIteratorDirect = require('../internals/get-iterator-direct');
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| 6 | var notANaN = require('../internals/not-a-nan');
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| 7 | var toPositiveInteger = require('../internals/to-positive-integer');
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| 8 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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| 9 | var IS_PURE = require('../internals/is-pure');
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| 10 |
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| 11 | var IteratorProxy = createIteratorProxy(function () {
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| 12 | var iterator = this.iterator;
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| 13 | var next = this.next;
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| 14 | var result, done;
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| 15 | while (this.remaining) {
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| 16 | this.remaining--;
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| 17 | result = anObject(call(next, iterator));
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| 18 | done = this.done = !!result.done;
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| 19 | if (done) return;
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| 20 | }
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| 21 | result = anObject(call(next, iterator));
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| 22 | done = this.done = !!result.done;
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| 23 | if (!done) return result.value;
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| 24 | });
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| 25 |
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| 26 | // `Iterator.prototype.drop` method
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| 27 | // https://github.com/tc39/proposal-iterator-helpers
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| 28 | $({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
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| 29 | drop: function drop(limit) {
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| 30 | anObject(this);
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| 31 | var remaining = toPositiveInteger(notANaN(+limit));
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| 32 | return new IteratorProxy(getIteratorDirect(this), {
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| 33 | remaining: remaining
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| 34 | });
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| 35 | }
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| 36 | });
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