Node.js substr() function

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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