numberSigningSum

numberSigningSum.ts

function numberSigningSums(num:number =5555531):any{

    let arr=[...String(num)].map(x=>Number(x))
    
        if(arr.length<2){
            return arr[0]
        }
        let sum=0
    for(let i=0;i<arr.length;i+=2){
            if(arr[i+1]){
                sum+=arr[i]-arr[i+1]
            }
            else{
                sum+=arr[i]
            }

    }
    return sum
}

console.log(numberSigningSums())