Math.floor vs Math.round vs parseInt vs Bitwise

JavaScript performance comparison

Revision 55 of this test case created

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Rounding in all form possible

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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 >> 1;
83784 / 9289.2 >> 1;
7 / 60 >> 1;
pending…
Math.ceil
Math.ceil(8945.938 - 293.3) / 10;
Math.ceil(83784 - 289.2) / 10;
Math.ceil(7 / 60);
pending…

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2 comments

brandon commented :

floor, round and bitwise shift don't result in the same operation, this is comparing apples to oranges.

Yaakov commented :

Instead of "* >> 1" (= divide by 2) it should be "* >> 0" (= divide by 1).

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