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Node.js | Buffer.readInt8() Method

  • Last Updated : 31 Dec, 2019

The Buffer.readUInt8() method is used to read an unsigned 8-bit integer from a Buffer from a with the specific offset.

Syntax:

Buffer.readInt8( offset )

Parameters: This method accepts single parameter offset which represents the number of bytes to skip before starting to read. The value of offset lies between the range 0 to buffer.length – 1. Its default value is 0.

Return Value: This method returns the 8-bit signed integer value at specified offset.

Example 1:






// Node.js program to demonstrate the
// buffer.readUInt8() method
const value = Buffer.from([ -2, 3 ]);
  
// Reads the first value
console.log(value.readInt8(0));
  
// Reads the second value
console.log(value.readInt8(1));
  
// Throws an error
console.log(value.readInt8(2));

Output:

-2
3
RangeError [ERR_OUT_OF_RANGE]: The value of "offset" is out of range.

Example 2




// Node.js program to demonstrate the
// buffer.readUInt8() method
const obj = Buffer.from([ 0X52, 0X40, 0X78 ]);
  
// It returns the first value
console.log(obj.readUInt8(0));
  
// It returns the third value
console.log(obj.readUInt8(2));
const temp = Buffer.from("XYZ");
  
// It returns the ASCII value of capital 'X'
console.log(temp.readUInt8(0));

Output:

82
120
88

Note: Integers that reads from the Buffer are illustrated as two’s complement signed values.

Reference: https://nodejs.org/api/buffer.html#buffer_buf_readint8_offset

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