Question

How to count the numbers with even number of digits in an array with JavaScript

Answer 1

function count_even_numbers(arr) {
    let result = 0;
    let size = arr.length;
    
    for (let i = 0; i < size; i++) {
        let total_digits = Math.floor((Math.log10(arr[i]))) + 1;
        if (total_digits % 2 == 0) {
            result++;
        }
    }
    
    return result;
}

const array = [564, 90, 7, 1248, 47325, 834921, 1234567, 0, 99];

console.log(count_even_numbers(array));




/*
run:

4

*/

 

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