Trying to add string starting from the right going to the left in a specific area-CodePudding

I've been trying to figure out how to add period as a string in a certain place, here's the code

function fixBalance(amount){
  if(amount <= 99999999){
    var amt = "0."   amount.toString().padStart(8, "0");
    return Number(amt);
  } else {
    return false;
  }
}

console.log(fixBalance(1));
console.log(fixBalance(1000));
console.log(fixBalance(10000000));
console.log(fixBalance(1000000000));

Basically, there are 8 spaces to the right of the 0

After it passes 8 numbers, I want numbers to keep going past the period

For example:

1 = 0.00000001

1000 = 0.00001000 or 0.00001

10000000 = 0.10000000 or 0.1

100001000 = 0.100001000

1000000001 = 10.00000001

1010000000 = 10.10000000

10100000000 = 101.00000000

If I were to put in 1000000000, it should be 10.00000000 or 10 as a numerical number

Trying to figure out how to do that with the else statement

Thank you!

CodePudding user response：

How about determining the integer and decimal parts separately before composing them?

function fixBalance(amount){
  const divisor = 100_000_000;
  const integer = Math.floor(amount / divisor);
  const decimal = amount % divisor;
  
  return integer.toString()   "."   decimal.toString().padStart(8, "0");
}

console.log(fixBalance(1));
console.log(fixBalance(1000));
console.log(fixBalance(10000000));
console.log(fixBalance(1000000000));