how to find sum of integer in react

Question

Let's suppose I have an integer value as

const num = 123456789

and I want to print the sum of these no. in react as 1+2+3+4+5+6+7+8+9 = 45

expect output = 45

approach I am following is as follows

const [total, setTotal] = useState(0);

const num = 123456789
for (const element of num ) {
   setTotal(total + element) 
}

console.log(total)

Output I am getting is : 01

Need your help here please!

You don't need state for this task `\`${n}\`.split('').map(Number).reduce((a,b) => a+b, 0)` — evolutionxbox, Sep 30 '22 at 13:10

score 4 · Answer 1 · answered Sep 30 '22 at 13:11

4

You can continuously divide by 10 until the number becomes 0 and use % 10 to get the last digit.

let num = 123456789;
let sum = 0;
for (; num; num = Math.floor(num / 10)) 
  sum += num % 10;
console.log(sum);

answered Sep 30 '22 at 13:11

Unmitigated

score 1 · Answer 2 · answered Sep 30 '22 at 13:21

1

A one-liner

const num = 123456789
console.log(num.toString().split('').reduce((acc, elem) => elem*1+acc, 0))

answered Sep 30 '22 at 13:21

2 Answers2