Truncate number to two decimal places without rounding

Question

Suppose I have a value of 15.7784514, I want to display it 15.77 with no rounding.

var num = parseFloat(15.7784514);
document.write(num.toFixed(1)+\"


        

Answer 1

Just truncate the digits:

function truncDigits(inputNumber, digits) {
  const fact = 10 ** digits;
  return Math.floor(inputNumber * fact) / fact;
}