Caballerog

In order to run this image do: docker-compose up -d to get all up. On first run DB initialization and initial user setup is done like so:

First start a bash in the container: docker-compose exec sentry /bin/bash. Then, inside bash, do sentry upgrade wait until it asks you for an inital user. When finished exit the bash.

When in doubt check with docker-compose ps if all went fine.

Caballerog

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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Caballerog

function factorial(num) {
    return num === 0 ? 1: (num * factorial(num - 1));
}

Caballerog

function factorial(num){
  let total = 1;
  for (i=1; i <= num; ++i) {
    total = total * i;
  }
  return total;
}

Caballerog

const add = (x, y) => x + y;
const calculateBill = (sumOfCart, tax) => sumOfCart * tax;

Caballerog

const memoize = fn => {
  const cache = {}; // 1
  return (...args) => { // 2
    const stringfiedArgs = JSON.stringify(args); // 3
    const result = (cache[stringifiedArgs] = 
                    typeof cache[stringifiedargs] === 'undefined'
                     ? fn(...args)
                     : cache[stringifedArgs]); // 4
    return result; // 5
  };

Caballerog

const add = (x, y) => x + y;
const addMemoized = memoize(add); // Decorator Pattern

Caballerog

const isUniqueExponential = arr => {
  let result = true;
  for (let i = 0; i < arr.length; i++){
    for (let j = 0; j < arr.length; j++){
      if (i !== j && arr[i] === arr[j]) {
        result = false;
      }
    }
  }
  return result;

Caballerog

const randomArray = length => 
  Array.from({ length }, () => Math.floor(Math.random() * length));

const params = [
  randomArray(19000),
  randomArray(19000),
  randomArray(19000),
  randomArray(19000),
];

Caballerog

const measureTime = (cb, ...args) => {
  const t0 = performance.now();
  cb(...args);
  const t1 = performance.now();
  console.log('Call to doSomething took ' + (t1 - t0) + ' milliseconds.');
};