JS Interview Questions Snipets

closure-exercicse.md

What would be the output of these?

1

function() {
  this.foo = 'bar';
  const dummyFn = () => this.foo;

  console.log(dummyFn());
}

2

function() {
  this.foo = 'bar';
  const dummyFn = function() { return this.foo };

  console.log(dummyFn());
}

hoisting.md

Hoisting

1

console.log(foo);
var foo = 'bar';

2

console.log(foo);
let foo = 'bar';

is-this-a-pure-fn.md

Is this a pura function?

let foo = 'bar';

function dummyFn() {
  foo = '---';
}

side-effect.md

Design-wise, what's wrong with this function

const fruitArr = ["🍇", "🍈", "🍉", "🍊", "🍋"];

const getRandomElementFromArray = function (paramArr) {
  const randomNumber = Math.floor(Math.random() * paramArr.length);
  return fruitArr[randomNumber];
};

const randomEl = getRandomElementFromArray(fruitArr);
console.log(randomEl);