Given:

const arr = [5,6,7];
arr.map(x => x*2);

What does this output?

const str = "JavaScript";
console.log(str.charAt(4));

What is the output of:

document.querySelectorAll('button').forEach(btn => btn.style.color = 'red');

Given:

const nums = [1,2,3];
const result = nums.map(n => n+2);

What is the correct way to declare a constant variable?

function getComputerChoice() {
 const choices = ["rock", "paper", "scissors"];
 const randomIndex = Math.floor(Math.random() * choices.length);
 return choices[randomIndex];
} 

Context:

Given:

let a = { x: 1 };
let b = a;
a = { x: 2 };