Comparing custom and bult-in Math.round (v2)

Revision 2 of this benchmark created on

Description

See: http://stackoverflow.com/q/8483357/1011582

Custom Math.round implementation is:

R1(a,b){var c=a%b;return a-c+(c/b+1.5>>1)*b}

Setup

function R1(a,b){var c=a%b;return a-c+(c/b+1.5>>1)*b}
    R2 = Math.round;
    function R3(a){return Math.round(a)}
    
    tally = 0

Test runner

Ready to run.

Testing in
TestOps/sec
Custom Math.round
tally += R1(tally,1);
ready
Built-in Math.round (direct)
tally += R2(tally);
ready
Built-in Math.round (wrapped)
tally += R3(tally);
ready
Custom Math.round #OPT
R1(3.5,1)
ready
Built-in Math.round (direct) #OPT
R2(3.5)
ready
Built-in Math.round (wrapped) #OPT
R3(3.5)
ready

Revisions

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