Entry

How can I find the bit length of an integer?

How can I find the number of bits an integer has?

Mar 25th, 2000 16:26
Martin Honnen,

The following function calls toString(2) to convert to binary notation 
and then takes the length:

function bitLength (n) {
  return n.toString(2).length;
}

Examples:
  alert(bitLength(2))
  alert(bitLength(16))