Node.js Buffer.swap64() Method
The Buffer.swap64() method is an inbuilt application programming interface of class Buffer within Buffer module which is used to swap the buffer byte order in-place. The swapping is performed by interpreting buffer as an array of 64-bit numbers.
Syntax:
Buffer.swap64()
Parameters: This method does not accept any parameters.
Return value: It returns the reference to the buffer.
Error thrown: It throws ERR_INVALID_BUFFER_SIZE if length of buffer (buf.length) is not a multiple of 8.
Below examples illustrate the use of Buffer.swap64() Method in Node.js:
Example 1:
const buf = Buffer.from([0x7, 0x0, 0x1,
0x1, 0x4, 0x5, 0x4, 0x6]);
console.log(buf);
buf.swap64();
console.log(buf);
|
Output:
<Buffer 07 00 01 01 04 05 04 06>
<Buffer 06 04 05 04 01 01 00 07>
Example 2: We will look at error thrown by this method
const buf = Buffer.from([0x0,
0x1, 0x2, 0x3, 0x4, 0x5]);
console.log(buf);
try {
buf.swap64();
console.log(buf);
}
catch (e) {
console.log( "Entering catch block" );
console.log(e);
}
|
Output:
<Buffer 00 01 02 03 04 05>
Entering catch block
RangeError [ERR_INVALID_BUFFER_SIZE]: Buffer size must be a multiple of 64-bits
at Buffer.swap64 (buffer.js:1059:11)
at /home/runner/index.js:14:9
.......
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_swap64
Last Updated :
13 Oct, 2021
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