The **`buf.writeInt8()` function** writes a given value at a given offset in the buffer that calls the `buf.writeInt8()` function.

## Parameters and return value
The `buf.writeInt8()` function accepts the following  three parameters: 
* **`value`**: The value that is written to the buffer. 
* **`offset`**: The position in the buffer where the value is written. An `offset` of 3 would mean the value is written at the fourth-byte position. `offset` must fulfill the condition `0 <= offset <= buf.length - byteLength`, and is set to 0 by default.

The `buf.writeInt8()` function returns the number of bytes written plus the offset as an integer value.

The `value` must be an 8-bit signed integer.
> An 8-bit signed integer has a range of -128 to 127, whereas an 8-bit unsigned integer has a range of 0 to 255.

## Example
The following example demonstrates how to write an 8-bit signed value to a buffer.


//create buffer
const buffer = Buffer.alloc(4)
console.log(buffer)

//define value
const val1 = 88

const val2 = 23

const val3= -45
//write to buffer
buffer.writeInt8(val1, 0)

buffer.writeInt8(val2, 1)

buffer.writeInt8(val3, 2)

console.log(buffer)

The program creates a buffer of zeros of size 4 bytes. It then defines three values and writes them to the buffer with appropriate offsets.
>The program will display an undefined behavior if the value is not a signed integer.

How to use the buf.writeInt8() function in Node.js

Prototype

Parameters and return value

Example