codewars #93 Number Format (6kyu)

#93 Number Format

Format any integer provided into a string with "," (commas) in the correct places.

Example:

numberFormat(100000); // return '100,000'

numberFormat(5678545); // return '5,678,545'

numberFormat(-420902); // return '-420,902'

function numberFormat(number) {
  //return number.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
  return number.toLocaleString();
}