jozsefs

const observer = new MutationObserver((mutations) => 
  mutations.forEach((mutation) => 
    console.log(`New layout: ${mutation.target.getAttribute('data-layout')}`)
  )    
);

observer.observe(document.body, { 
  attributes: true,
  attributeFilter: ['data-layout'] 
});

jozsefs

const letters = ['I', 'V', 'X', 'L', 'C', 'D', 'M'];
const values = {
	I: 1,
	V: 5,
	X: 10,
	L: 50,
	C: 100,
	D: 500,
	M: 1000
};

jozsefs

Scaling your API with rate limiters

The following are examples of the four types rate limiters discussed in the accompanying blog post. In the examples below I've used pseudocode-like Ruby, so if you're unfamiliar with Ruby you should be able to easily translate this approach to other languages. Complete examples in Ruby are also provided later in this gist.

In most cases you'll want all these examples to be classes, but I've used simple functions here to keep the code samples brief.

Request rate limiter

This uses a basic token bucket algorithm and relies on the fact that Redis scripts execute atomically. No other operations can run between fetching the count and writing the new count.

jozsefs

function isPrime(num) {
	for (let i = 2, s = Math.sqrt(num); i <= s; i++) {
		if (num % i === 0) {
			return false;
		}
	}
	return num !== 1;
}

function getBiggestPrimeInNumber(num) {

jozsefs

package main

import (
	"fmt"
	"math"
	"strconv"
	"log"
	"sort"
	"time"
	"errors"

jozsefs

package main

import (
	"fmt"
	"sort"
)

var BOOK_PRICE = 8

var priceMultiplier = map[int]float32{

jozsefs

const PATH_CHAR = 1;
const EMPTY_CHAR = 0;

function spiralize(size) {
	const arr = createArray(size);
	return generateSpiral(arr).forEach(drawLine);
}

function generateSpiral(arr) {
	const len = arr.length;

jozsefs

function catMouse(map, maxMoves){
	const pos = map.split('\n').reduce((acc, row, idx) => {
		const catIndex = row.indexOf('C');
		const mouseIndex = row.indexOf('m');

		if (catIndex > -1) {
			acc.cat = [idx, catIndex];
		}
		if (mouseIndex > -1) {
			acc.mouse = [idx, mouseIndex];

jozsefs

module.exports = {
  output: {
    filename: '[name]-[chunkhash].js',
  },
  plugins: [
    new webpack.HashedModuleIdsPlugin(),
    new webpack.optimize.CommonsChunkPlugin({
      name: 'vendor',
      minChunks: m => /node_modules/.test(m.context),
    }),

jozsefs

function alphabetWar(battlefield) {
    const remaining = [];
    const splitStr = battlefield.split(/(\[[^\]]*\])/g);
    const hasNuke = battlefield.indexOf('#') > -1;
    
    splitStr.forEach((item, idx) => {
      const isInShelter = item.indexOf('[') === 0;

      // the whole thing was put together in like 20 minutes #ripReadability
      if (!hasNuke || isInShelter && (