Node.js substr() function
Last Updated :
30 Mar, 2023
The substr() function is a string function of Node.js which is used to extract sub-string from the given string.
Syntax:
string.substr(index, length)
Parameters: This function accepts two parameters as mentioned above and described below:
- index: This parameter holds the starting index of the specified sub-string.
- length: This parameter holds the length of the sub-string.
Return Value: The function returns the sub-string from the given string.
The below programs demonstrate the working of substr() function:
Example 1:
javascript
function findsubstr(str) {
let substring = str.substr(11, 13);
console.log(substring);
}
const str = "Welcome to GeeksforGeeks" ;
findsubstr(str);
|
Output:
GeeksforGeeks
Example 2:
javascript
function findsubstr(str, index, length) {
let substring = str.substr(index, length);
console.log(substring);
}
const str = "Welcome to GeeksforGeeks" ;
const index = 11, length = 13;
findsubstr(str, index, length);
|
Output:
GeeksforGeeks
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