How do i change a number into fixed notation, like K, M, or B, in Javascript?

Question

I'm trying to change a number into a fixed notation, for example when the number is over 1000, change the number into x.x K, and so far everything i have tried has failed. You can see my code if you go to this link: https://jsfiddle.net/Blackcatgame77/vnzewfr1/7/ . I have a function ready to change my number into notation, here is the function

function formatter(cash) {
     if (cash >= 1000000000) {
        return (cash / 1000000000).toFixed(1).replace(/\.0$/, '') + 'B';
     }
     if (cash >= 1000000) {
        return (cash / 1000000).toFixed(1).replace(/\.0$/, '') + 'M';
     }
     if (cash >= 1000) {
        return (cash / 1000).toFixed(1).replace(/\.0$/, '') + 'K';
     }
}

I'm not sure how to use this function to make the numbers change into notation when they reach 1000, 1000000, or 1000000000. Can someone tell me how i could do this?

Answer 1

I managed to figure it out, and here's how i did it. I defined a second variable from the currency called cashE, and then changed the variable being displayed from cash to cashE. To notate cash, i used this code:

  let cashE = cash;
  if (cash >= 1e+3) {
    cashE = (cash / 1e+3).toFixed(1).replace(/\.0$/, '') + 'K';
  }
  if (cash >= 1e+6) {
    cashE = (cash / 1e+6).toFixed(1).replace(/\.0$/, '') + 'M';
  }
  if (cash >= 1e+9) {
    cashE = (cash / 1e+9).toFixed(1).replace(/\.0$/, '') + 'B';
  }

I hope this helps anyone who was wondering how to do this :)