Node.js Buffer.readUInt8() Method
Last Updated :
13 Oct, 2021
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The Buffer.readUInt8() method is used to read an unsigned 8 bit integer from a Buffer object.
Syntax:
buffer.readUInt8( offset )
Parameters: This method accepts a single parameter offset which specifies the position of buffer object. It represents the number of bytes to skip before starting to read. The value of offset lies between the range 0 to buffer.length – 1. The default value is 0.
Return value: It returns the integer value specified by the offset.
Example 1:
// Node.js program to demonstrate the // buffer.readUInt8() method const ob=Buffer.from([1, 2, 3]); // It reads the first value console.log(ob.readUInt8(0)); // It reads the second value console.log(ob.readUInt8(1)); // It throws an error console.log(ob.readUInt8(4)); |
Output:
1
2
RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range.
It must be >= 0 and <= 2. Received 3
at boundsError (internal/buffer.js:53:9)
at Buffer.readUInt8 (internal/buffer.js:141:5)
Example 2:
// Node.js program to demonstrate the // buffer.readUInt8() method const ob1 = Buffer.from([0X32, 0X44, 0X48]); // It returns the first value console.log(ob1.readUInt8(0)); // It returns the third value console.log(ob1.readUInt8(2)); const t = Buffer.from("abc"); // It returns the ASCII value of 'a' console.log(t.readUInt8(0)); |
Output:
68 72 97
Note: The above program will compile and run by using the node index.js command.
Reference: https://nodejs.org/api/buffer.html#buffer_buf_readuint8_offset
