The collection of Characters is known as String. The strings can be declared using single quotes or double quotes. For instance:

let str = "Javascript is a good language;

We can extract the length of the string in Javascript by using the code below -

let str = "Javascript is a good language"; let len = str.length; console.log(len);
//Output: 29 (spaces included)

Javascript Strings Escape Sequence

Various Javascript sequences are mentioned below -

• /b - Backspace
• /n - New Line
• /f - Form Feed
• /r - Carriage Return
• /t - Horizontal Tabular
• /v - Vertical Tabular

Javascript String Methods

Several Javascript String Methods supported by Javascript are mentioned below -

1. Slice - The `slice()` extracts a portion of the string and returns the extracted portion of the string. The code for the same is given below -



let numbers = "one, two, three"; let num = numbers.slice(5,6) console.log(num)
//Output: t

2. substr() - The `substr()` is somewhat similar to slice(). The code for the same is as follows -

let numbers = "one, two, three"; let num = numbers.substr(-4); console.log(num)
//output: hree

3. replace() - It replaces a specific portion of the string with the mentioned one. The code for the same is as follows -



let str = "javascript is best"; let my_str = str.replace("best", "awesome") console.log(my_str) //output:
javascript is awesome

4. toUpperCase() - It converts the string to upper case. The code for the same is as follows -



let str = "javascript"; let str_up = str.toUpperCase() console.log(str_up) //output:
JAVASCRIPT

5. toLowerCase() - It converts the string to Lower case. The code for the same is as follows -

let str = "JAVASCRIPT"; let str_up = str.toLowerCase() console.log(str_up)
//output: javascript

6. concat() - It is used to merge two or more strings using plus(+) operator. The code for the same -

let str_1 = "javascript"; let str_2 = "is best"; let str_3 = str_1 + str_2; console.log(str_3);
//output: javascript is best

7. trim() - It is used to remove the whitespaces from the string. The code for the same is as follows -

let str_1 = " javascript "; let str_2 = str_1.trim(); console.log(str_2);
//output: javascript

8. charAt() - The charAt() returns the character at a specified location. The code for the same is as follows -

let str_1 = "javascript"; let str_2 = str_1.charAt(0);
console.log(str_2); //output: j

String Search

Several Javascript String Search are mentioned below -

1. indexOf() - The indexOf()returns the index location of the first occurrence in the string. The code for the same is as follows -

let str = "Javascript is the best among all languages" let index = str.IndexOf("javascript")
//Output: 0

2. lastIndexOf() - The lastIndexOf() returns the index value starting to search from backwards. The code for the same is as follows -

let str = "Javascript is the best among all languages" let index = str.lastIndexOf("javascript")
console.log(index) //Output: 18

3. search() - The Javascript search() method is used to use to search a string for a string and return the position of the match.


4. match() - The match()method is used to return a matching string against a string.


5. include() - The matchAll() method returns an iterator that contains the results of matching a string against a string.


6. includes() - The includes() method returns true if a string contains a specific value. The code for the same is as follows -

let text = "Javascript is the best among all languages"; text.includes("all");
//output: true

7. startsWith() - The startsWith() method returns true if the string begins with the specified value. The code for the same is as follows -



let text = "Javascript is the best among all languages"; text.startsWith("Javascript");
//output: true

8. endsWith() - The endsWith() method returns true if the string ends with the specified value. The code for the same is as follows -



let text = "Javascript is the best among all languages"; text.startsWith("languages");
//output: languages