The Math.trunc() function in JavaScript is used to return the integer part of a floating-point number by removing the fractional digits. In other words, Math.trunc() function cuts off the dot and the digits to the right of it.

**Syntax:**

Math.trunc(value)

**Parameters:** This function accepts a single parameter *value *. It is the floating-point number which is to be sent to the Math.trunc() function.

**Return Value:** The Math.trunc() function returns the integer part of the given number.

Below example illustrates the Math.trunc() function in JavaScript:

- When a positive number of float type is passed as a parameter:
`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write(Math.trunc(15.56));`

`</`

`script`

`>`

Output:

15

- When a negative number of float type is passed as a parameter:
`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write(Math.trunc(-15.56));`

`</`

`script`

`>`

Output:

-15

- When a positive number between 0 and 1 is passed as a parameter:
`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write(Math.trunc(0.236));`

`</`

`script`

`>`

Output:

0

- When a negative number between 0 and 1 is passed as a parameter:
`<`

`script`

`type`

`=`

`"text/javascript"`

`>`

`document.write(Math.trunc(-0.236));`

`</`

`script`

`>`

Output:

0

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