Do you know what will be the output of this code? console.log(Array.from({ length: 3 }, (_, i) => i * 2));

[undefined, undefined, undefined]

What does Array.from({ length: 3 }) create?

Do you know what will be the output of this code?

JavaScript

console.log(Array.from({ length: 3 }, (_, i) => i * 2));

Show answer and explanation

The answer is [0, 2, 4].

{ length: 3 } is an array-like object with three empty slots. Array.from calls the map function for each index, and i * 2 gives 0, 2, 4.