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

import csv
import genanki
from gtts import gTTS
import unicodedata
import re
import os
import sys
from pathlib import Path

if len(sys.argv) < 2:

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

[
  {
    "id": 1,
    "radical": "一",
    "pinyin": "yī",
    "english": "one",
    "strokeCount": 1
  },
  {
    "id": 2,

branneman

export const getSettlement = (transactions) => {
  const settlement = []

  let recurProtection = 0
  while (true) {
    const balances = getBalances(transactions.concat(settlement))
    if (allBalancesZero(balances)) break

    if (recurProtection++ > 1e2) {
      console.log({ settlement })

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

$source = "C:\Program Files (x86)\World of Warcraft\_classic_era_\Screenshots"
$destination = "C:\Users\branv\Proton Drive\bran.van.der.meer\My files\70 - Backups\wow-classic\Screenshots"

$zipFolder1 = "C:\Program Files (x86)\World of Warcraft\_classic_era_\Interface"
$zipFolder2 = "C:\Program Files (x86)\World of Warcraft\_classic_era_\WTF"
$zipLocation = "C:\Users\branv\Proton Drive\bran.van.der.meer\My files\70 - Backups\wow-classic\"
$zipDate = Get-Date -Format "yyyy-MM-dd"
$zipFileName = "$zipLocation\wowclassic-backup-$zipDate.zip"

if (!(Test-Path -Path $destination)) {

branneman

#lang racket/base

(require
 net/http-easy)

(define (base-url path)
  (string-append "https://httpbin.org" path))

; request:  GET
; response: plain string body

branneman

def application(environ, start_response):
    import sys
    path = 'YOUR_WWW_ROOT_DIRECTORY'
    if path not in sys.path:
        sys.path.append(path)
    from pyinfo import pyinfo
    output = pyinfo()
    start_response('200 OK', [('Content-type', 'text/html')])
    return [output]

branneman

JavaScript knowledge

• Operators, operands, operator precedence (unary, binary, ternary)
• Dynamic Type system: types and conversion
  • Value type vs. Reference type
• Expression vs. Statement
• Scope
• Hoisting
• Overloading
• Prototypal inheritance vs. Classical inheritance
• Instancing