Node.js slice() function

The slice() function is a string function of Node.js which is used to extract sub-string from a string. 

Syntax:

string.slice( start, end )

Parameters: This function uses three parameters as mentioned above and described below:

• string: It holds the string content. The substring is extracted from this string.
• start: This parameter holds the starting index of the sub-string.
• end: This parameter holds the ending index of the sub-string.

Return type: The function returns the substring. 

The program below demonstrates the working of the function: 

Program 1:

javascript

function findsubstr(str) {
    const index = str.slice(12, 25);
    console.log(index);
}

const str = "Welcome to GeeksforGeeks";

findsubstr(str);

Output:

GeeksforGeeks

Program 2:

javascript

function findsubstr(str, start, end) {
    const index = str.slice(start, end);
    console.log(index);
}
const str = "Welcome to GeeksforGeeks";

const start = 0;
const end = 6;

findsubstr(str, start, end);

Output:

Welcome