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 Laratutorials."; 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!