Toby toboid
toboid
/ gcd-loop.js
Created
November 23, 2025 11:25
Greatest common divisor in JavaScript using euclidean algorithm
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| function gcd(a, b) { | |
| while (b > 0) { | |
| [a, b] = [b, a % b] | |
| } | |
| return a; | |
| } |
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| const arr = [1, 8, 3, 9]; | |
| for (const [i, element] of arr.entries()) { | |
| // i is the index | |
| // element is the array element | |
| } |
toboid
/ react-test-utils-simulate.js
Created
December 26, 2017 21:53
Using ReactTestUtils.renderIntoDocument and ReactTestUtils.Simulate
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| import React from "react"; | |
| import ReactTestUtils from "react-dom/test-utils"; | |
| const PageLink = ({ page, onClick }) => ( | |
| <a href={`?page=${page}`} onClick={onClick}> | |
| Page {page} | |
| </a> | |
| ); | |
| // ReactTestUtils.renderIntoDocument doesn't work with functional components |
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| function pipe (...funcs) { | |
| if (!funcs.length) { | |
| throw new Error('pipe requires at least 1 argument'); | |
| } | |
| return (...args) => funcs.slice(1).reduce((accum, func) => func(accum), funcs[0](...args)) | |
| } | |
| // Usage | |
| pipe((a, b) => a + b)(1, 2); // => 3 |
toboid
/ standard-deviation.js
Last active
September 2, 2017 16:23
Calculating variance and standard deviation
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| const orderCounts = [3, 34, 15, 55, 6, 7]; | |
| const mean = sample => sample.reduce((sum, x) => sum + x, 0) / sample.length; | |
| const square = x => x * x; | |
| const difference = x => y => x - y; | |
| const variance = sample => mean(sample.map(difference(mean(sample))).map(square)); | |
| // Variance | |
| const σ2 = variance(orderCounts); | |
| // Standard deviation |
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| <?xml version="1.0" encoding="UTF-8"?> | |
| <xsd:schema ...> | |
| <xsd:import | |
| namespace="http://www.google.com/schemas/sitemap-news/0.9" | |
| schemaLocation="./test/schemas/sitemap-news.xsd"/> | |
| ... | |
| </xsd:schema> |
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| const assert = require('assert'); | |
| const fs = require('fs'); | |
| const libxmljs = require('libxmljs'); | |
| // Read the sitemap and schema from the file system | |
| // Could just as easily get these over HTTP | |
| const sitemap = fs.readFileSync('../sitemap.xml'); | |
| const schema = fs.readFileSync('./schemas/sitemap.xsd'); | |
| // Parse the sitemap and schema |
toboid
/ nvm_global.sh
Created
June 18, 2017 15:24
Use nvm to find which node versions a global module is installed for
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| nvm_global () { | |
| PKG_NAME=$1 | |
| VERSIONS=() | |
| I=0 | |
| for VER in $(nvm_ls) | |
| do | |
| nvm exec --silent ${VER} npm ls -g ${PKG_NAME} --depth=0 >/dev/null 2>&1 | |
| if [ $? -eq 0 ]; then |
toboid
/ promisify-multiple-args.js
Created
June 18, 2017 15:20
util.promisify where callback takes multiple arguments
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| const {promisify} = require('util'); | |
| const child = require('child_process'); | |
| const exec = promisify(child.exec); | |
| exec('echo "Hello world"').then( | |
| result => console.log(result), // Prints { stdout: 'Hello world\n', stderr: '' } | |
| error => console.error(error) | |
| ); |
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| const {promisify} = require('util'); | |
| const fs = require('fs'); | |
| const readFile = promisify(fs.readFile); | |
| // await can only be used within an async function | |
| (async () => { | |
| try { | |
| const fileContents = await readFile('./foo.txt'); | |
| console.log(fileContents.toString()); | |
| } catch (ex) { |
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