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Node.js substr() function

  • Last Updated : 14 Oct, 2021
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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 sub-string.

Return Value: The function returns the sub-string from given string.

Below programs demonstrate the working of substr() function:



Program 1:




function findsubstr(str) {
  
    var substring = str.substr(11, 13);
      
    console.log(substring);
}
  
var str = "Welcome to GeeksforGeeks";
  
findsubstr(str);

Output:

GeeksforGeeks

Program 2:




function findsubstr(str, index, length) {
  
    var substring = str.substr(index, length);
      
    console.log(substring);
}
  
var str = "Welcome to GeeksforGeeks";
  
var index = 11, length = 13;
  
findsubstr(str, index, length);

Output:

GeeksforGeeks
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