BITLSHIFT Function

BITLSHIFT.js

// Copyright (c) 2012 Sutoiku, Inc. (MIT License)

function BITLSHIFT(number, shift) {
  // Return error if either number is a non-numeric value
  if (isNaN(number) || isNaN(shift)) return '#VALUE!';

  // Return error if number is less than 0
  if (number < 0) return '#NUM!';

  // Return error if number is a non-integer
  if (Math.floor(number) !== number) return '#NUM!';
  
  // Return error if number is greater than (2^48)-1
  if (number > 281474976710655) return '#NUM!';

  // Return error if the absolute value of shift is greater than 53
  if (Math.abs(shift) > 53) return '#NUM!';

  // Return number shifted by shift bits to the left or to the right if shift is negative
  return (shift >= 0 ) ? number << shift : number >> -shift;
}