41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
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'use strict';
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var setPrototypeOf = require('es5-ext/object/set-prototype-of')
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, d = require('d')
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, Iterator = require('../')
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, validIterable = require('../valid-iterable')
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, push = Array.prototype.push
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, defineProperties = Object.defineProperties
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, IteratorChain;
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IteratorChain = function (iterators) {
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defineProperties(this, {
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__iterators__: d('', iterators),
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__current__: d('w', iterators.shift())
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});
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};
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if (setPrototypeOf) setPrototypeOf(IteratorChain, Iterator);
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IteratorChain.prototype = Object.create(Iterator.prototype, {
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constructor: d(IteratorChain),
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next: d(function () {
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var result;
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if (!this.__current__) return { done: true, value: undefined };
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result = this.__current__.next();
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while (result.done) {
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this.__current__ = this.__iterators__.shift();
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if (!this.__current__) return { done: true, value: undefined };
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result = this.__current__.next();
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}
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return result;
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})
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});
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module.exports = function () {
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var iterators = [this];
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push.apply(iterators, arguments);
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iterators.forEach(validIterable);
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return new IteratorChain(iterators);
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};
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