Javascript Strings

In JavaScript, strings are used to represent text and are declared using quotes, either single (') or double ("). Here are some important aspects of working with strings in JavaScript:

A javascript string can be created in 2 ways -

By string literal

A string literal is created by enclosing the text within double quotes ("). Here's an example:

var myString = "your text";

You can also use single quotes (') to create a string literal:

var schoolName1 = "Rian International";  // Double quotes
var schoolName2 = 'DPS';                 // Single quotes
Let's see the simple example of creating string literal.

Input:-

Output:-

By string object (using new keyword)

In JavaScript, a string object can be created using the new keyword. Here's the syntax:

var myString = new String("your text");

The new keyword is used to create an instance of the String object. However, using the string literal syntax ("your text") is generally preferred over creating string objects with the new keyword.

Here's an example that demonstrates creating a string in JavaScript using the new keyword:

Input:-

Output:-

Note:- Don't create strings as objects. It slows down execution speed. The new keyword complicates the code. This can produce some unexpected results.

String Length

You can determine the length of a string using the length property.

Input:-

Output:-

Escape character

Because strings must be written within single or double quotes, JavaScript will misunderstand the below string:-

var x = "I have a pet named "maggi" since 2 years.";

The string will be cut to "I have a pet named ".

To avoid this problem, we need to use the backslash escape character.

The backslash () escape character replaces special characters into string characters:

So now the above string will become like given below:-

var x = "I have a pet named "maggi" since 2 years.";

There are six other escape sequences are valid in JavaScript:

Note:- The 6 escape characters above were originally designed to control typewriters, teletypes, and fax machines. They do not make any sense in HTML.

Equal operator for string literal and string object

var x = "Charlie";             

var y = new String("Charlie");

For the above two strings (x == y) is true because x and y have equal values

But for (x === y) it will be false because x and y have different types (string and object)