Math.floor vs Math.round vs parseInt vs Bitwise

JavaScript performance comparison

Revision 5 of this test case created by John-David Dalton and last updated

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Rounding in all form possible

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Testing in unknown unknown
Test Ops/sec
Math.floor
Math.floor(89.938 / 293.3);
Math.floor(83784 / 9289.2);
Math.floor(7 / 60);
pending…
Math.round
Math.round(89.938 / 293.3);
Math.round(83784 / 9289.2);
Math.round(7 / 60);
pending…
parseInt
parseInt(89.938 / 293.3);
parseInt(83784 / 9289.2);
parseInt(7 / 60);
pending…
Bitwise |
89.938 / 293.3 | 0;
83784 / 9289.2 | 0;
7 / 60 | 0;
pending…
Bitwise
89.938 / 293.3 >> 0;
83784 / 9289.2 >> 0;
7 / 60 >> 0;
pending…

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3 comments

richtaur commented :

What about ~~?

payload commented :

how about floor = Math.floor floor(...)

ainthek commented :

what about bigger than 32bits ?

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