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What is Buffer.lastIndexOf() method in node.js?
Gutha Vamsi KrishnaThe lastIndexOf() method checks for the search term in the buffer object and returns it.
If the search term occurs more than once in a buffer, it will return the position of the last occurrence.
Syntax
buffer.lastIndexOf(value, start, encoding);
Parameters
value: This is the search term that needs to be searched in the buffer.start: This signals where to begin the search in the buffer. The default is0.encoding: If the search term isstring, then this parameter is used to specify the encoding.
Return value
The lastIndexOf() method returns the last occurrence for given search term.
This method returns
-1if the search term is not found in the buffer.
Code
Example 1
In the example below:
- We are trying to find the last index of
iin thebuf. Here, we have multiple occurrences ofi: one is at index2, and another is at index5. So, thelastIndexOfmethod will return the last occurrence, that is index5.
const buf = Buffer.from("This is an example")
//getting last index of i
console.log(buf.lastIndexOf('i'))Example 2
In the example below:
- We are trying to find
z, which is not present in the buffer objectbuf, so thelastIndexOfmethod will return-1.
const buf = Buffer.from("This is an example")
//accessing the index of z which is not present in buffer
console.log(buf.lastIndexOf('z'))RELATED TAGS
node.js
buffer
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