branneman

// 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));

branneman

Better local require() paths for Node.js

Problem

When the directory structure of your Node.js application (not library!) has some depth, you end up with a lot of annoying relative paths in your require calls like:

const Article = require('../../../../app/models/article');

Those suck for maintenance and they're ugly.

Possible solutions

branneman

'use strict'

const { isNull, isStr, isRegExp } = require('./types')

module.exports = matchAll

/**
 * RegExp: Get all matches and capturing groups
 * @param {RegExp} re
 * @param {String} str

branneman

Primitive Types & Reference Types in JavaScript

An explanation of JavaScript's pass-by-value, which is unlike pass-by-reference from other languages.

Facts

• JavaScript has 2 kinds of variable types: primitive and reference.
• A fixed amount of memory is reserved after creation of every variable.
• When a variable is copied, it's in-memory value is copied.
• Passing a variable to a function via a call also creates a copy of that variable.

Primitive Types

branneman

const crypto = require('crypto')
const { promisify } = require('util')
const pbkdf2 = promisify(crypto.pbkdf2)

module.exports = { createHashPasswordFn, isPasswordCorrect }

/**
 * @typedef {Object} HashPassword
 * @property {String} hash
 * @property {String} salt

branneman

/**
 * @param {Event} evt
 * @return {Object}
 */
function getMousePosition(evt) {

  var pageX = evt.pageX;
  var pageY = evt.pageY;
  if (pageX === undefined) {
    pageX = evt.clientX + document.body.scrollLeft + document.documentElement.scrollLeft;

branneman

var fn = function(arg1, arg2) {
    var str = '<p>aap ' + this.noot + ' ' + arg1 + ' ' + arg2 + '</p>';
    document.body.innerHTML += str;
};
var context = {
    'noot': 'noot'
};
var args = ['mies', 'wim'];

// Calls a function with a given 'this' value and arguments provided individually.

branneman

<?php
/**
 * Case in-sensitive array_search() with partial matches
 *
 * @param string $needle   The string to search for.
 * @param array  $haystack The array to search in.
 *
 * @author Bran van der Meer <branmovic@gmail.com>
 * @since 29-01-2010
 */

branneman

const { curryN, curry } = require('./curry') // https://gist.github.com/branneman/4ffb7ec3fc4a2091849ba5d56742960c

// Array
const length = list => list.length
const nth = curry((key, list) => list[key])
const slice = curry((from, to, list) => list.slice(from, to))
const head = nth(0)
const init = slice(0, -1)
const tail = slice(1, Infinity)
const last = slice(-1, Infinity)

branneman

const curryN = (fn, arity, accIn = []) => (...args) => {
  const len = args.length
  const accOut = accIn.concat(args)
  if (len + accIn.length >= arity) {
    return fn.apply(this, accOut)
  }
  return curryN(fn, arity, accOut)
}

const curry = fn => curryN(fn, fn.length)