How to sum all the digits of a given number in JavaScript

#javascript #javascriptexample
Sum of the digits of a given number

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[sergeiivanov]

Interesting!
Also, you could mention another approach to the problem without using String methods (however, the String method is far more efficient when dealing with large numbers, and vice versa while the loop approach is better for small numbers like 15, 124):

function sumDigit(num){ const digits = []; while (num !== 0){ dig = num % 10; num = Math.floor(num / 10) | 0; digits.push(dig);} return digits.reduce((a, b) => a + b, 0); }

Recursion: function sumDigit(n, k){ let digits = [...n.toString()].map(e => parseInt(e)); return k === digits.length ? 0 : sumDigit(n, k + 1);

Also, we can use a function instead of using "+" as in this example: function sum(a, b){ return b === 0 ? a : sum(a ^ b, (a & b) << 1); }
However, if you tell me that this is a bad practice, you will be definitely right! But for learning why not. Keep it up, sir!