Node.js Buffer.concat() Method
The Buffer.concat() method is used to concat all buffer objects in a given array into one buffer object. The return value of this method is also a buffer. If the length of the buffer is not provided then it is calculated from the Buffer instances in the list.
Syntax:
Buffer.concat( list, length )
Parameters: This method accepts two parameters as mentioned above and described below:
- list: Contains the list of buffers to concat.
- length: It defines the length of the concatenated buffer. This parameter is optional.
Example 1: In this example, we will see the use of Buffer.concat() method
javascript
// Returns a new buffer with the // copy of the passed string const buf1 = Buffer.from( "Beginner" ); // Returns another buffer with // copy of the passed string const buf2 = Buffer.from( "for" ); const buf3 = Buffer.from( "Beginner" ); // Creates an array of buffers const list = [buf1, buf2, buf3]; // Concatenates all buffer objects into one buffer const newbuff = Buffer.concat(list); console.log( "The concatenated buffer:" ); // Displays the concatenated buffer console.log(newbuff); |
Output:
The concatenated buffer: <Buffer 47 65 65 6b 73 66 6f 72 47 65 65 6b 73>
Example 2: In this example, we will see the use of the Buffer.concat() method
javascript
// Returns a new buffer with the // copy of the passed string const buf1 = Buffer.from( "Good" ); // Returns another buffer with // copy of the passed string const buf2 = Buffer.from( "morning" ); const buf3 = Buffer.from( "everyone" ); // Creates an array of buffers const list = [buf1, buf2, buf3]; // Concatenates all buffer objects // into one buffer const newbuff = Buffer.concat(list); console.log( "The concatenated buffer:" ); // Displays the concatenated buffer console.log(newbuff); |
Output:
The concatenated buffer: <Buffer 47 6f 6f 64 6d 6f 72 6e 69 6e 67 65 76 65 72 79 6f 6e 65>
Note: The above program will compile and run by using the node index.js command. Reference: https://nodejs.org/dist/latest-v13.x/docs/api/buffer.html#buffer_class_method_buffer_concat_list_totallength
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