Why does this map return undefined values?

programming web dev
1

Consider this snippet.

const nums = [1, 2, 3];
const out = nums.map((n) => { n * 2; });
console.log(out);

Why is the output not [2, 4, 6], and what is the simplest fix.

BayMax

2

map needs your callback to return a value, and braces switch the arrow function into a block so n * 2 gets computed then thrown away.

WaffleFries