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
