Map numbers String to Array of numbers

Question

I can't see why this code doesn't produce numbers. Can anyone explain please?

a = '1 3 2 6 1 2'.split(' ');
a = a.map(Number);

for (item in a){
    console.log(typeof(item));
}

The output for me in Chrome is 6 strings.

Answer 1

You need to use for..of, not for..in to iterate Arrays:

arr = '1 2 3 4'.split(' ').map(Number) // ["1","2","3","4"] => [1,2,3,4]

for( item of arr ) console.log( typeof(item), item )