round to nearest .25 javascript

Question

I want to convert all numbers to the nearest .25

So...

5 becomes 5.00
2.25 becomes 2.25
4 becomes 4.00
3.5 becomes 3.50

Thanks

Answer 1

If speed is your concern, note that you can get about a 30% speed improvement by using:

var nearest = 4;
var rounded = number + nearest/2 - (number+nearest/2) % nearest;

From my website: http://phrogz.net/round-to-nearest-via-modulus-division
Performance tests here: http://jsperf.com/round-to-nearest