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33 lines
680 B
JavaScript
33 lines
680 B
JavaScript
"use strict";
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const Promise = require("bluebird");
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const pipe = require("@promistream/pipe");
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const rangeNumbers = require("@promistream/range-numbers");
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const map = require("@promistream/map");
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const collect = require("@promistream/collect");
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const buffer = require("./");
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function duplicateEven() {
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return pipe([
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map((value) => {
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if (value % 2 === 0) {
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return [value, value];
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} else {
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return [];
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}
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}),
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buffer()
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]);
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}
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return Promise.try(() => {
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return pipe([
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rangeNumbers(0, 20),
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duplicateEven(),
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collect()
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]).read();
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}).then((result) => {
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console.log(result);
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// [ 0, 0, 2, 2, 4, 4, 6, 6, 8, 8, 10, 10, 12, 12, 14, 14, 16, 16, 18, 18 ]
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});
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