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Node.js substr() function

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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

Last Updated : 30 Mar, 2023
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