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February 14, 2019 09:28
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Create CSV files with dummy data (using node.js)
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| const fs = require('fs'); | |
| const cols = 8; | |
| function randomChar () { | |
| return String.fromCharCode(Math.floor(Math.random() * (122-65) + 65)); | |
| } | |
| function randomString (length) { | |
| let string = ''; | |
| for (let i = 0; i < length; i++) { | |
| string += randomChar(); | |
| } | |
| return string; | |
| } | |
| function randomRow () { | |
| const cells = []; | |
| for (let i = 0; i < cols; i++) { | |
| cells.push(randomString(20)); | |
| } | |
| return cells.join(',') + '\n'; | |
| } | |
| async function writeRow (stream) { | |
| return new Promise((resolve, reject) => { | |
| stream.write(randomRow(), 'utf8', () => resolve()); | |
| }); | |
| } | |
| async function createCSVs (sizes) { | |
| sizes.forEach(async size => { | |
| const stream = fs.createWriteStream(`dummy${size}.csv`); | |
| for (let i = 0; i < size; i++) { | |
| await writeRow(stream); | |
| } | |
| stream.end(); | |
| }); | |
| } | |
| createCSVs([1000, 10000, 100000, 1000000]); |
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