JavaScript Strings

The JavaScript string is an object that represents a sequence of characters.

There are 2 ways to create string in JavaScript

  1. By string literal
  2. By string object (using new keyword)

By string literal

The string literal is created using double quotes. The syntax of creating string using string literal is given below:

var stringname=“string value”;

Let’s see the simple example of creating string literal.


Output:

By string object (using new keyword)

The syntax of creating string object using new keyword is given below:

var stringname=new String(“string literal”);

Here, new keyword is used to create instance of string.

Let’s see the example of creating string in JavaScript by new keyword.

Output:

JavaScript String Methods

Let’s see the list of JavaScript string methods with examples.

MethodsDescription
charAt()It provides the char value present at the specified index.
charCodeAt()It provides the Unicode value of a character present at the specified index.
concat()It provides a combination of two or more strings.
indexOf()It provides the position of a char value present in the given string.
lastIndexOf()It provides the position of a char value present in the given string by searching a character from the last position.
search()It searches a specified regular expression in a given string and returns its position if a match occurs.
match()It searches a specified regular expression in a given string and returns that regular expression if a match occurs.
replace()It replaces a given string with the specified replacement.
substr()It is used to fetch the part of the given string on the basis of the specified starting position and length.
substring()It is used to fetch the part of the given string on the basis of the specified index.
slice()It is used to fetch the part of the given string. It allows us to assign positive as well negative index.
toLowerCase()It converts the given string into lowercase letter.
toLocaleLowerCase()It converts the given string into lowercase letter on the basis of host?s current locale.
toUpperCase()It converts the given string into uppercase letter.
toLocaleUpperCase()It converts the given string into uppercase letter on the basis of host?s current locale.
toString()It provides a string representing the particular object.
valueOf()It provides the primitive value of string object.
split()It splits a string into substring array, then returns that newly created array.
trim()It trims the white space from the left and right side of the string.

JavaScript String charAt(index) Method

The JavaScript String charAt() method returns the character at the given index.

Output:

JavaScript String concat(str) Method

Output:

JavaScript String indexOf(str) Method

Output:

JavaScript String lastIndexOf(str) Method

The JavaScript String lastIndexOf(str) method returns the last index position of the given string.

Output:

JavaScript String toLowerCase() Method

The JavaScript String toLowerCase() method returns the given string in lowercase letters.

Output:

JavaScript String toUpperCase() Method

The JavaScript String toUpperCase() method returns the given string in uppercase letters.

JavaScript String slice(beginIndex, endIndex) Method

The JavaScript String slice(beginIndex, endIndex) method returns the parts of string from given beginIndex to endIndex. In slice() method, beginIndex is inclusive and endIndex is exclusive.

JavaScript String trim() Method

The JavaScript String trim() method removes leading and trailing whitespaces from the string.


Output:

JavaScript String split() Method

It splits a string into substring array, then returns that newly created array.

Output:

 

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Hello, I am Dharmendra Yadav and I am a Blogger, Web Developer, Web Designer, Search Engine Optimizer, Digital Marketing Instructor. You can find me on Facebook , Linkedin

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