-
-
Save wzul/aa735c5212c648395f0b8658d1347d31 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function round(value, precision, mode) { | |
var m, f, isHalf, sgn; | |
precision |= 0; | |
m = Math.pow(10, precision); | |
value *= m; | |
sgn = (value > 0) | -(value < 0); | |
isHalf = value % 1 === 0.5 * sgn; | |
f = Math.floor(value); | |
if ( isHalf ) { | |
switch (mode) { | |
case 'PHP_ROUND_HALF_DOWN': | |
// rounds .5 toward zero | |
value = f + (sgn < 0); | |
break; | |
case 'PHP_ROUND_HALF_EVEN': | |
// rouds .5 towards the next even integer | |
value = f + (f % 2 * sgn); | |
break; | |
case 'PHP_ROUND_HALF_ODD': | |
// rounds .5 towards the next odd integer | |
value = f + !(f % 2); | |
break; | |
default: | |
// rounds .5 away from zero | |
value = f + (sgn > 0); | |
} | |
} | |
return ( isHalf ? value : Math.round(value) ) / m; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment