20 + JavaScript String Methods

JavaScript string methods; Through this tutorial, i am going to show you javascript string methods with help of examples.

JavaScript String Methods

There are 20+ important and useful javascript string methods; as shown below:

  • Length Method
  • toLocaleLowerCase() Method
  • toLocaleLowerCase() Method
  • indexOf() Method
  • search() Method
  • slice() Method
  • substring() Method
  • substr() Method
  • replace() Method
  • includes() Method
  • concat() Method
  • charAt() Method
  • charCodeAt() Method
  • lastIndexOf() Method
  • trim() Method
  • match() Method
  • split() Method
  • toString() Method
  • valueOf() Method

1. length() Method

It is used to count the number of characters in a string javascript.

Use the following example using the javaScript length method to count the number of characters in String; as shown below:

var lng = "Hello lara";
var x = lng.length;
Output 

// return 
9

2. toLocaleLowerCase() Method

The javascript toLocaleLowerCase() is used to changed string into lower case.

See the following example to convert string to lowercase using the toLocaleLowerCase() method:

var str = "Hello Dev!";
var res = str.toLocaleLowerCase();
Output
// return
hello dev!

3. toLocaleUpperCase() Method

The javascript toLocaleUpperCase () is used to changed string into upper case.

See the below given example to convert string to upper case string;

var str = "Hello Dev!";
var res = str.toLocaleUpperCase();
Output
// return
HELLO DEV!

4. indexof() Method

The indexof () method returns the first position of a specified value in a string.

If you want to find or get the position of specified value or characters in string; use the following example:

 var txt = "Lets find where 'pen' occurs!";
 var test = txt.indexOf("pen");
Output

// return
17

5. search() Method

The javascript search () method searches a string for the specified value, and returns the status of the match.

See the following example for search sub string into given string; as shown below:

var str = "hello dev!"; 
var n = str.search("dev");
Output
//Return
6

6. slice() Method

The slice () method removes the parts of a string and returns the extracted parts to a new string.

Use the Start and End Ultimate to specify the part of the string that you want to remove.

var str = "Developers world!"; 
var res = str.slice(0, 10);
Output
// return
Developers

7. substring() Method

The Javascript substring() method is used to removes the characters from one string, between two specified indices, and returns the new substring.

  var str = "Hello dev!";
  var res = str.substring(1, 4);
Output
//return
ell

8. substr() Method

A string substr() method begins on the character in the specified position, and returns the specified number of characters.

 var str = "Hello dev!";
 var res = str.substring(1, 4);
Output
//return
ello

9. replace() Method

The Javascript replace() changes the defined value to an another value:

var str = "Hello Dev!";
var res = str.replace("Dev", "World");
Output
// return
Hello World

10. includes() Method

The includes() method is used to determine whether a string contains the characters of a specified string or not. If is exist return true or not return false.

var str = "Hello world, my name is tutsmake.";
var n = str.includes("name");
Output
// return 
True

11. concat() Method

The concat() method is used for join two or more strings.

var str1 = "Hello ";
var str2 = "keny!";
var res = str1.concat(str2);
Output
// return
Hello Keny

12. charAt() Method

The Javascript charAt() is used to take a character to a described index location:

var txt = "Hello Keny";
txt.charAt(0);
Output
// return
H

13. charCodeAt() Method

The charCodeAt() method returns the Unicode of the character at a specified index in a string:

var str = "TEST";
str.charCodeAt(0); 
Output
// return
84

14. lastIndexOf () Method

The lastIndexOf() the method returns the index of the last occurrence of a specified text in a string:

var str = "Your are talented dev";
var pos = str.lastIndexOf("dev");
Output
// return
18

15. trim() Method

The javascript trim() method removes whitespace from both sides of a given string:

var str = "       Trim Both Side        ";
alert(str.trim());
Output
// return
Trim Both Side

16. match() Method

The match() method searches a string for a match against a regular expression, and returns the matches, as an Array object.

  var str = "lopersum lopersum lopersum lopersum."; 
  var res = str.match(/sum/g);
Output
// return
 sum,sum,sum,sum

17. split Method

The javascript split method, which is used to convert string to an array:

var str = "1,2,3,4,5";
var arr = str.split(",");
document.write(arr[0]);
document.write("<br>");
document.write(arr[1]);
Output
// return
1
2

18. toString() Method

The javascript toString() method returns the value of a String object.

var str = "javaScript World!";
var res = str.toString();
Output
// return
javaScript World!

19. valueOf() Method

The javascript valueOf() method, which is used to gets the primitive value of a String object.

  var str = "javaScript World!";
  var res = str.valueOf();
Output
// return
javaScript World!

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