(Medium) - How To Build A Money Data Type In JavaScript

ImplementationOfToDecimalFunction.js

const toDecimalPoint = (cents) => {
  const sign = cents < 0 ? '-' : '';
  const columns = cents < 0
    ? cents.toString().split('').slice(1, Infinity)
    : cents.toString().split('');
  const result = columns.slice();
  const dotLocation = columns.length - 2;

  if (dotLocation < 0) {
    return sign + '$0.0' + result.join('');
  }
  if (dotLocation === 0) {
    return sign + '$0.' + result.join('');
  }
  if (dotLocation > 0) {
    result.splice(dotLocation, 0, '.');
    return sign + '$' + result.join('');
  }
};