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Node.js Buffer.writeBigInt64LE() Method

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  • Last Updated : 07 Jul, 2020
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The Buffer.writeBigInt64LE() method is an inbuilt application programming interface of class Buffer within the Buffer module which is used to writes little endian 64-bits Big integer value to an allocated buffer at the specified offset.

Syntax:

Buffer.writeBigInt64LE( value, offset )

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

  • value: This parameter specifies big integer value to be written to the buffer. It should be a valid 64 bits little endian Big inteter value. Behavior is undefined when value is anything other than this.
  • offset: It specifies the number of bytes to skip before write or simply signify the index in the buffer. The value of offset lies 0 <= offset <= Buffer.length – 8. Its default value is 0.

Return Value: This method returns an integer value that is the sum of offset and number of bytes written.

Below examples illustrate the use of Buffer.writeBigInt64LE() method in Node.js:

Example 1:
Filename: index.js




// Node.js program to demonstrate the
// buffer.writeBigInt64lE() method 
const buf = Buffer.allocUnsafe(8);
  
// Writing big integer value into buffer
// by using writeBigInt64LE() method
buf.writeBigInt64LE(0x01030405060708n, 0);
  
// Display the buffer
console.log(buf);

Run the index.js file using the following command:

node index.js

Output:

<Buffer 08 07 06 05 04 03 01 00>

Example 2:
Filename: index.js




// Node.js program to demonstrate the
// buffer.writeBigInt64lE() method 
const buf = Buffer.allocUnsafe(8);
  
// Writing big integer value into buffer
// by using writeBigInt64LE() method
buf.writeBigInt64LE(0xaa03040506efffn, 0);
  
// Display the buffer
console.log(buf);

Run the index.js file using the following command:

node index.js

Output:

<Buffer ff ef 06 05 04 03 aa 00>

Reference: https://nodejs.org/dist/latest-v12.x/docs/api/buffer.html#buffer_buf_writebigint64le_value_offset

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