JavaScript Math.trunc() Method

　JavaScript Math Object

Math.trunc()The method returns the integer part of the number by removing any decimal.

is different from the other three Math methods:Math.floor(),Math.ceil()andMath.round()The working principle of Math.trunc() is very simple. Regardless of whether the parameter is a positive number or a negative number, it will truncate the decimal point and digits on the right.

Note: The Math.trunc() method will not round up the number/Round down to the nearest integer, just removing the decimal.

The parameters passed to this method are implicitly converted to the number type.

Because trunc() is a static method of Math, you always use it asMath.trunc()，not used as a method of the created Math object.

Syntax:

Math.trunc(x)

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('Hello');　　　//　NaN

Browser Compatibility

The numbers in the table specify the first browser version that fully supports the Math.trunc() method:

Parameter Value

Technical Details

　JavaScript Math Object