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44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
"use strict";
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const Promise = require("bluebird");
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const fs = require("fs");
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const through2 = require("through2");
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const fromNodeStream = require("./");
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const pipe = require("@promistream/pipe");
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const collect = require("@promistream/collect");
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const rangeNumbers = require("@promistream/range-numbers");
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const bufferedMap = require("@promistream/buffered-map");
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const map = require("@promistream/map");
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let transform = through2.obj((chunk, encoding, callback) => {
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callback(null, chunk + 5);
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});
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return Promise.try(() => {
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return pipe([
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rangeNumbers(0, 10),
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fromNodeStream(transform),
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collect()
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]).read();
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}).then((result) => {
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console.log("transform result:", result);
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return pipe([
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fromNodeStream(fs.createReadStream("example.js", { encoding: "utf8" })),
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bufferedMap((line) => line.split("\n")),
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collect()
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]).read();
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}).then((result) => {
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console.log("read result:", result);
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return pipe([
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rangeNumbers(0, 10),
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map((line) => String(line) + "\n"),
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fromNodeStream(fs.createWriteStream("numbers.txt", { encoding: "utf8" }))
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]).read();
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}).then((result) => {
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console.log("write result:", result);
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console.log("numbers.txt contents:");
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console.log(fs.readFileSync("numbers.txt", { encoding: "utf8" }));
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});
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