Node.js | Buffer.allocUnsafe() Method

The Buffer.allocUnsafe() method is an inbuilt application programming interface of class Buffer with in Buffer module which is used to allocate the buffer of given size but not initialize it.

Syntax:

const Buffer.allocUnsafe( size)

Parameters: This method accepts a single parameter size which holds the desired size of the buffer.



Return value: It allocates the buffer of the given size.

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

Example 1:

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// Node program to demonstrate the 
// Buffer.allocUnsafe(size) method
    
// Creating a buffer of given size
const buf = Buffer.allocUnsafe(10);
    
// Display the result
console.log("10 size Buffer created");
console.log(buf);

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Output:

10 size Buffer created
<Buffer 88 c4 62 ba 48 02 00 00 a8 c5>

Example 2:

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// Node program to demonstrate the 
// Buffer.allocUnsafe(size) method
    
// Creating a buffer of given size
const buf = Buffer.allocUnsafe(10);
   
// Display the result
console.log("Before filling the Buffer");
console.log(buf);
   
// Fill buffer with element 'G'
buf.fill('G');
    
// Display the result
console.log("After filling Buffer");
console.log(buf);

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Output:

Before filling the Buffer

After filling Buffer

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

Reference: https://nodejs.org/dist/latest-v13.x/docs/api/buffer.html#buffer_class_method_buffer_allocunsafe_size



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