Unable to delete map entries using map.delete() function

September 10, 2022

I’m trying to delete the entry with key ‘1’ in the map. Can anyone tell me why is map.delete(1) returning false and the entry is not being deleted.

let nums = [1,1,1,2,2,3]
let map = new Map();
    for (let num of nums) {
        if (num in map) {
            map[num]++;
        } else {
            map[num] = 1;
        }
    }
    console.log(map) // Map(0) { '1': 3, '2': 2, '3': 1, '4': 3 }
    console.log(map.delete(1)); // false
    console.log(map) // Map(0) { '1': 3, '2': 2, '3': 1, '4': 3 }

>Solution :

let nums = [1,1,1,2,2,3, 4]
let map = new Map();
for (let num of nums) {
    if (num in map) {
        map.set(num, map.get(num)++);
    } else {
        map.set(num, 1)
    }
}
console.log(map)
console.log(map.delete(1))
console.log(map)