In Javascript, many string methods are either built-in or user-defined. Built-in string methods are the methods that are present in any programming language library.

Built-in string methods of JavaScript:

1. search() : — It is used to search a string for a specific value or an expression. It returns the position of the match.

    Code:-
    function myfunction(){
        var str = "Pawan kumar jha";
        var a = str.search("jha");
        console.log(a);
    }
    myfunction();
    Output:-
    12
   

2. split(): — It is used to split a string into an array of substrings.

    Code:-
    function myfunction(){
        var str = "Pawan kumar jha";
        var a = str.split(" ");
        console.log(a);
    }
    myfunction();
    Output:-
    ["Pawan", "kumar", "jha"]
    0:"Pawan"
    1:"kumar"
    2:"jha"
   

3. startsWith(): — It is used to check whether a string begins with the specified characters.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.startsWith("Pawan");
       console.log(a);
    }
    myfunction();
    Output:-
    true
   

4. slice(): — It is used to extract a part of a string and return a new string.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.slice(0,6);
       console.log(a);
    }
    myfunction();
    Output:-
    Pawan
   

5. concat(): — It is used to combine texts of two strings and return a new string.

    Code:-
    function myfunction(){
       var str = "Pawan kumar ";
       var str1 = "Jha"
       var a = str.concat(str1);
       console.log(a);
    }
    myfunction();
    Output:-
    Pawan kumar Jha
   

6. charAt(): — It is used to return the character at the specified index.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.charAt(6);
       console.log(a);
    }
    myfunction();
    Output:-
    k
   

7. indexOf(): — It is used to return the index, within the string object, which occurs first, of the specified value. It returns -1 if the object is not found.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.indexOf("Pawan");
       console.log(a);
    }
    myfunction();
    Output:-
    0
   

8. lastIndexOf(): — It is used to return the index, within the string object, which occurs last, of the specified value. It returns -1 if the object is not found.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.indexOf("Jha");
       console.log(a);
    }
    myfunction();
    Output:-
    12
   

9. match(): — It is used to match a regular expression against a string.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.match("Pawan");
       console.log(a);
    }
    myfunction();
    Output:-
    ["Pawan", 0, "Pawan kumar Jha", unde...]
            0:"Pawan"
   

10. replace(): — It is used to find a match between a regular expression and a string. The matched substring is replaced with a new substring.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.replace("kumar", "");
       console.log(a);
    }
    myfunction();
    Output:-
    Pawan  Jha
    

11. substr(): — It is used to return the characters in a string, beginning at the specified location, through the specified number of characters.

    Code:-
    Approach - 1:
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.substr(5,6);
       console.log(a);
    }
    myfunction();
    Output:-
    kumar
    Approach - 2:
    function myfunction(){
    var str = "Pawan kumar jha";
    var a = str.substr(5);
    console.log(a);
    }
    myfunction();
    Output:-
    kumar Jha
    

12. substring(): — It is used to return the characters in a string between the two specified indexes.

    Code:-
    Approach - 1:
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.substring(6,12);
       console.log(a);
    }
    myfunction();
    Output:-
    kumar
    Approach - 2:
    Code:-
    Approach - 2:
    function myfunction(){
    var a = str.substring(6,12);
    console.log(a);
    }
    myfunction();
    Output:-
    kumar
    

13. toLowerCase(): — It is used to convert the string value which is called, to lower case.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.toLowerCase();
       console.log(a);
    }
    myfunction();
    Output:-
    pawan kumar jha
    

14. toUpperCase(): — It is used to convert the string value which is called, to upper case.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.toUpperCase();
       console.log(a);
    }
    myfunction();
    Output:-
    PAWAN KUMAR JHA
    

15. valueOf(): — It is used to return the primitive value of the specified object.

    Code:-
    function myfunction(){
       var str = "Pawan kumar jha";
       var a = str.valueOf();
       console.log(a);
    }
    myfunction();
    Output:-
    Pawan kumar Jha
    

    🚀Thank You🚀