Javascript:check given number armstrong without string manipulations

 

Check given number is armstrong number.

Code:

let number = 153

function isArmstrong(number){

   let num = number;

   let sum =0

   let length = 0

   let digits =[]

   while(num > 0){

        let digit = num %10;

        num = Math.floor(num /10)

        length ++;

        digits.push(digit)

   }

   sum = digits.reduce((acc,item)=>{

     acc =acc + item ** length

     return acc;

   },0)

   console.log(`sum=${sum}`)

   return sum == number

}

console.log(isArmstrong(number))

Output:

    sum=153

    true