lantosgyuri

const numbers = [1,2,3,4,5,5,4];

const uniqueItems = Array.from(new Set(numbers));

console.log(uniqueItems);

lantosgyuri

const createAdder = (base) => (secondary) => secondary + base;
const numbers = [1,2,3,4,5];

const fns = numbers.map(item => createAdder(item));
const pipe = (...fns) => x => fns.reduce((y, f) => f(y), x);
const addAll = pipe(...fns);

// console.log(addAll(6));

lantosgyuri

const arr = [1,2,3];
const arr2 = [4,5,6,[7], [8]];
console.log(arr.concat(arr2)); // not flattened
console.log([...arr, ...arr2]); // not flattened
console.log(arr.concat(...arr2)); // flattened

lantosgyuri

// This is not my code, I've just saved it for myself. Origin: https://github.com/leighhalliday/reduce-example

const people = [
    { id: "1", name: "Leigh", age: 35 },
    { id: "2", name: "Jenny", age: 30 },
    { id: "3", name: "Heather", age: 28 },
];

let result;

lantosgyuri

const array = [
  1, 2, 3, 4,
];

const createAsyncfunction = number => new Promise((resolve, reject) => {
  const tiemout = Math.floor(Math.random() * Math.floor(10));
  if (number === 3) reject('Bad number');
  else {
    setTimeout(() => {
      console.log('number is printed: ', number);