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Node.js Buffer.alloc() method
Gutha Vamsi KrishnaThe Node.js Buffer.alloc() method allocates a new Buffer with a specific size.
Syntax
Buffer.alloc(size, fill, encoding);
Parameters
Size: The new buffer length.Fill: Pre-fill the buffer with a value. Defaultfillis 0.Encoding: Iffillis the string, then this defines the encoding type for that string. Default encoding isutf8.
Note
-
TypeErrorwill be thrown ifsizeis not a number. -
If
sizeis larger than buffer.constants.MAX_LENGTH or smaller than 0, ERR_INVALID_OPT_VALUE is thrown. -
If
sizeis0, a zero-length buffer will be created.
Example 1
- Allocates buffer with length
5. - Fill is
0because it is not specified. - Encoding defaults to
utf8.
const buf = Buffer.alloc(5); console.log(buf);
Example 2
- Allocates buffer with length 8.
- Since fill is
aand default encoding isutf8, buffer fills with correspondingutf8value charactera.
const buf = Buffer.alloc(8,'a'); console.log(buf);
//buffer fills with utf8 values for the given fill-'abcde' const buf = Buffer.alloc(5,'abcde'); console.log(buf);
Example 3
We can also explicitly provide other encoding types like base64.
const buf = Buffer.alloc(11, 'abcdefghijk', 'base64'); console.log(buf);
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