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47 lines
836 B
47 lines
836 B
3 years ago
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/**
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* Obliterator Chain Function
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* ===========================
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*
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* Variadic function combining the given iterables.
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*/
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var Iterator = require('./iterator.js');
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var iter = require('./iter.js');
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/**
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* Chain.
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*
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* @param {...Iterator} iterables - Target iterables.
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* @return {Iterator}
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*/
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module.exports = function chain() {
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var iterables = arguments;
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var current = null;
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var i = -1;
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/* eslint-disable no-constant-condition */
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return new Iterator(function next() {
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var step = null;
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do {
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if (current === null) {
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i++;
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if (i >= iterables.length) return {done: true};
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current = iter(iterables[i]);
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}
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step = current.next();
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if (step.done === true) {
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current = null;
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continue;
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}
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break;
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} while (true);
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return step;
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});
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};
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