Do you know what will be the output of this code? const map = new Map(); map.set(1, "number"); map.set("1", "string"); console.log(map.size);

Why can a Map have both 1 and "1" as keys?

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

JavaScript

const map = new Map();
map.set(1, "number");
map.set("1", "string");
console.log(map.size);

Show answer and explanation

The answer is 2.

Map compares keys with SameValueZero, so the number 1 and the string "1" are different keys. A plain object would convert both to "1".