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Node.js | Buffer.includes() Method
  • Last Updated : 20 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.includes() method checks whether the provided value is present or included in the buffer or not.

Syntax:

buffer.includes( value, byteOffset, encoding );

Parameters: This method accept three parameters which are listed below:

  • value: It holds the value that you want to find in buffer.
  • byteOffset: It is optional parameter. It refers to the starting index from which the elements of input buffer will be searched. The default value is 0.
  • encoding: If the needed value is string, then you can add then encoding type also. The default value is utf-8.

Return Value: This method returns a Boolean value either True or False depending on the value. If value found in buffer then return True otherwise return False.



Below examples illustrate the use of Buffer.includes() Method in Node.js:

Example 1:




// Node.js program to demonstrate the  
// Buffer.includes() Method 
      
// Creating a buffer
const buffer = new Buffer('Geek One');
  
console.log(buffer.includes('Geek'));


Output:

true

Example 2:




// Node program to demonstrate the  
// Buffer.includes() Method 
      
const buffer = Buffer.from(
        'GeeksforGeeks: A computer science portal');
  
// Started checking the value from index 15 only
const output = buffer.includes('Geek', 15);
  
console.log(output);


Output:

false

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

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

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