parseInt() vs parseFloat() unary operator (v11)

Revision 11 of this benchmark created by David Reiman on

Description

There are three ways (I know of) to cast values to number in JS:

  • Using parseInt(string, radix) - don't forget the radix!
  • Using parseFloat(string)
  • Using a unary plus, like this: var myNumber = +myString;

This test compares the speed of each.

Setup

var stringNumbers = [];
    var i;
    for (i = 0; i < 10; ++i) {
      stringNumbers.push("" + Math.floor(Math.random() * 100));
    }
    var numbers = [];

Test runner

Ready to run.

Testing in
TestOps/sec
unary
var i;
for (i = 0; i < 10; ++i) {
  numbers.push(+stringNumbers[i]);
}
ready
parseInt
var i;
for (i = 0; i < 10; ++i) {
  numbers.push(parseInt(stringNumbers[i], 10));
}
ready
parseFloat
var i;
for (i = 0; i < 10; ++i) {
  numbers.push(parseFloat(stringNumbers[i]));
}
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.