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Node.js | Buffer.lastIndexOf() Method
  • Last Updated : 31 Dec, 2019

Buffer is a temporary memory storage which stores the data when it is being moved from one place to another. It is like an array of integers.

The Buffer.lastIndexOf() Method checks for a given value in the buffer and return its index where it is present. If same value is present more than once, then it returns the last index where the value is present.

Syntax:

Buffer.lastIndexOf( value, byteOffset, encoding )

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

  • value: It specifies the data that need to be search in the buffer.
  • byteOffset: The index from which you need to start searching the buffer. Its default value is 0.
  • encoding: It holds a string value that determine the binary representation of string that search in the buffer. Its default value is utf8.

Return Value: This method returns an integer value representing the index value.



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

Example 1:




// Node program to demonstrate the  
// Buffer.lastIndexOf() Method
  
var buffer = Buffer.from('GeeksForGeeks');
  
console.log(buffer.lastIndexOf('G'));


Output

8

Example 2:




// Node program to demonstrate the  
// Buffer.lastIndexOf() Method
  
var buffer = Buffer.from('GeeksForGeeks');
  
console.log(buffer.lastIndexOf(101));
// Prints : 10
// 101 is the ascii value of 'e'
// e occurs last at index 10
  
console.log(buffer.lastIndexOf('computer portal'));
//Prints : -1
//as it is not present in the given value


Output:

10
-1

Note: The above program will compile and run by using the node index.js command.

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

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