Node.js Buffer.writeInt16LE() Method

Last Updated : 13 Oct, 2021

The Buffer.writeInt16LE() method is an inbuilt application programming interface of class Buffer within Buffer module which is used to write a valid signed 16-bit integer to buffer at the specified offset with specified little endian format.

Syntax:

Buffer.writeInt16LE( value, offset )

Parameters: This method accept two parameters as mentioned above and described below:

value: The valid signed 16-bit integer to be written into the buffer.
offset: It denotes the number of bytes to be skipped before starting to write to buffer. The value of offset lies within the range 0 <= offset <= buf.length – 2. The default value of offset is 0.

Return value: It returns a buffer with the value inserted at specified offset in little endian format.

Below examples illustrate the use of Buffer.writeInt16LE() Method in Node.js:

Example 1:

// Node.js program to demonstrate the  
// Buffer.writeInt16LE() method  
      
// Creating a buffer  
const buf = Buffer.allocUnsafe(10);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x0114, 0);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x1015, 2);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x0016, 8);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x0217, 6);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x0518, 4);  
      
// Display the result  
console.log(buf);  

Output:

<Buffer 14 01 9b 02 00 00 00 00 a8 79>
<Buffer 14 01 15 10 00 00 00 00 a8 79>
<Buffer 14 01 15 10 00 00 00 00 16 00>
<Buffer 14 01 15 10 00 00 17 02 16 00>
<Buffer 14 01 15 10 18 05 17 02 16 00>

Example 2:

// Node.js program to demonstrate the  
// Buffer.writeInt16LE() method  
      
// Creating a buffer  
const buf = Buffer.allocUnsafe(6);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x2211, 0);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x4433, 2);  
  
// Display the buffer  
console.log(buf);  
  
// Using Buffer.writeInt16LE() method  
buf.writeInt16LE(0x6655, 4);  
  
// Display the buffer  
console.log(buf);  

Output:

<Buffer 11 22 00 00 00 00>
<Buffer 11 22 33 44 00 00>
<Buffer 11 22 33 44 55 66>

Note: The above program will compile and run by using the node index.js command.

Reference: https://nodejs.org/dist/latest-v13.x/docs/api/buffer.html#buffer_buf_writeint16le_value_offset

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