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Bran van der Meer branneman

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@branneman
branneman / fp-lenses.js
Last active Feb 25, 2020
JavaScript: Lenses (Functional Programming)
View fp-lenses.js
// FP Lenses
const lens = get => set => ({ get, set });
const view = lens => obj => lens.get(obj);
const set = lens => val => obj => lens.set(val)(obj);
const over = lens => fn => obj => set(lens)(fn(view(lens)(obj)))(obj);
const lensProp = key => lens(prop(key))(assoc(key));
View Carousel.js
@branneman
branneman / howto.md
Last active Oct 1, 2017
macOS: Manage Multiple versions of Java
View howto.md

macOS: Manage Multiple versions of Java

Setup tooling

brew update
brew install jenv
brew tap caskroom/cask
brew tap caskroom/versions
mkdir ~/.jenv/versions
@branneman
branneman / create-zip.js
Last active Jun 19, 2020
Node.js script to create a zip file from a list of files and directories
View create-zip.js
const stat = require('fs').statSync;
const AdmZip = require('adm-zip');
/**
* Example usage
*/
newArchive(`test-${+new Date}.zip`, [
'index.js',
'package.json',
'node_modules'
View a-page.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Homepage</title>
<!-- If HTTP/1: Inline with <style>, remove this <link> -->
<!-- If HTTP/2: Server push this CSS file, and leave this <link> -->
<link rel="stylesheet" href="critical-homepage.css">
@branneman
branneman / lambda-img-to-webp.js
Created May 5, 2017
AWS Lambda@Edge whitelisted image to webp request mapper
View lambda-img-to-webp.js
'use strict';
const whitelist = {
'/static/img/photo.jpg': '/static/img/photo.webp'
};
exports.handler = (event, context, callback) => {
// Grab HTTP request and it's headers
const request = event.Records[0].cf.request;
@branneman
branneman / app.js
Last active Jan 2, 2018
[FP playground] Generate diceware passwords with NodeJS. See also: https://www.rempe.us/diceware/
View app.js
const map = fn => list => list.map(fn);
const filter = fn => list => list.filter(fn);
const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));
const tail = list => list.slice(1);
const fill = val => num => new Array(num).fill(val);
const getFileContents = file => require('fs').readFileSync(file, { encoding: 'utf8' });
const split = char => str => str.split(char);
const join = char => list => list.join(char);
View keybase.md

Keybase proof

I hereby claim:

  • I am branneman on github.
  • I am branneman (https://keybase.io/branneman) on keybase.
  • I have a public key ASBUXh5Xc1fnzeLViPT2_Wo268hlgsOINNiGJ7UzbkiVXQo

To claim this, I am signing this object:

View prefixEventListener.js
/**
* Capitalize
*/
const capitalize = string => {
return string.charAt(0).toUpperCase() + string.slice(1);
};
/**
* Prefix EventListener
*/
@branneman
branneman / executedBatched.js
Created Nov 1, 2016
executeBatched() – Run a list of async tasks as promises and wait after each batch
View executedBatched.js
/**
* Run a list of async tasks as promises and wait after each batch
* @param {Number} batchSize - Number of tasks to run in parallel
* @param {Number} waitTime - Time to wait after each batch, in milliseconds
* @param {Array<Function>} tasks - Promise executor functions (not promise objects!)
* @return {Promise<Array<*>>}
*/
function executeBatched(batchSize, waitTime, tasks) {
tasks = tasks.slice();
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