The Math.trunc()
function returns the integer part of a number by removing any fractional digits.
Math.trunc()
Try it
Syntax
Math.trunc(x)
Parameters
-
x
-
A number.
Return value
The integer part of the given number.
Description
Unlike the other three Math
methods: Math.floor()
, Math.ceil()
and Math.round()
, the way Math.trunc()
works is very simple. It truncates (cuts off) the dot and the digits to the right of it, no matter whether the argument is a positive or negative number.
The argument passed to this method will be converted to number type implicitly.
Because trunc()
is a static method of Math
, you always use it as Math.trunc()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Examples
Using Math.trunc()
Math.trunc(13.37); // 13 Math.trunc(42.84); // 42 Math.trunc(0.123); // 0 Math.trunc(-0.123); // -0 Math.trunc('-1.123'); // -1 Math.trunc(NaN); // NaN Math.trunc('foo'); // NaN Math.trunc(); // NaN
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.trunc |
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
trunc |
38
|
12
|
25
|
No
|
25
|
8
|
38
|
38
|
25
|
25
|
8
|
3.0
|
1.0
|
0.12.0
|
See also
© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/trunc