How to add to a variable when addition is in an for-loop

Question

This is a problem from codewars . Heres my code.

function narcissistic(value) {
var total = 0
var valLength = value.length
const digit = [...`${value}`];
for(var i = 0; i < value.length; i++){
  total += Math.pow(value.length , digit)
}
  if(total == value){ return true

  } else {
    return false
  }
}

The problem I'm having is I don't why when I do total += value.length * digit[i] it isn't adding to total . Any ideas?

Answer 1

You can try something like this: You need to convert the function parameters into an array with different values and then calculate the power of each number and then add to the total. Also, try to use let instead of var as it is better for block-level scope.

 function narcissistic(value) { let total = 0; const digit = [...`${value}`]; for (let i = 0; i < digit.length; i++) { total += Math.pow(digit[i], digit.length); } if(total === value) { return true; } else { return false; } } console.log(narcissistic(153)); console.log(narcissistic(432));

Answer 2

This function can return you the required value

function narcissistic(value) {
    const stringValue = [...`${value}`];
    const len = stringValue.length;
    const sum = stringValue.reduce((prev, current) => {
        return prev + Math.pow(parseInt(current, 10), len);
    }, 0)
    return `${value}` === sum.toString();
}