Node.js Buffer.writeUIntLE() Method
The Buffer.writeUIntLE() method is used to write the specified bytes, using little endian, to a Buffer object. It supports up to 48 bits of accuracy. Its behavior is undefined when you use the value of anything other than an unsigned integer.
Buffer.writeUIntLE( value, offset, byteLength )
Parameters: This method accepts three parameters as mentioned above and described below:
- value: It specifies the number which needs to be written to the Buffer object.
- offset: It specifies the number of bytes to skip before starting to write into the buffer. The value of offset lies 0 <= offset <= buf.length – byteLength.
- byteLength: It specifies the number of bytes to write into the buffer. The value of byteLength lies 0 < byteLength <= 6.
Return value: It returns the offset plus the number of bytes written. The below examples illustrate the use of Buffer.writeUIntLE() Method in Node.js:
const buffer_1 = Buffer.allocUnsafe(4);
buffer_1.writeUIntLE(0x12127474, 0, 4);
const buffer_2 = Buffer.allocUnsafe(6);
buffer_2.writeUIntLE(0x12127474abcd, 0, 6);
<Buffer 74 74 12 12>
<Buffer cd ab 74 74 12 12>
const buffer = Buffer.allocUnsafe(8);
console.log("Before filling buffer");
console.log("After filling 6 bytes");
buffer.writeUIntLE(0xcc1267280012, 0, 6);
console.log("After filling next 2 bytes");
buffer.writeUIntLE(0x1112, 6, 2)
Before filling buffer
<Buffer 00 00 00 00 00 00 00 00>
After filling 6 bytes
<Buffer 12 00 28 67 12 cc 00 00>
After filling next 2 bytes
<Buffer 12 00 28 67 12 cc 12 11>
Note: The above program will compile and run by using the node index.js command.
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