Strings in JavaScript

A string is a text inside the quotes which can be either single or double quotes.

var string1 = "Double Quoted String";
var string2 = 'Single Quoted String';

Concatenating the Strings : This can be achieved in javascript by using + operator or using concat() method.

Example using + operator:-

var string1 = "Hello and Welcome";
var string2 = "to the Strings in JavaScript";
var result = string1 + " " + string2;
alert(result);

Example using concat() method:-

var string1 = "Hello and Welcome";
var string2 = "to the Strings in JavaScript";
var result = string1.concat(" ", string2);
alert(result);

Output of the above both Examples : Hello and Welcome to the Strings in JavaScript

 

Using Single Quotes inside a String:-

Way 1 : If you are using double quotes for string so, use single quotes inside the string wherever needed.

var str = "Hello and Welcome to the 'Strings' in JavaScript";
alert(str);

Way 2 : If you are using single quotes for string so, use escape character followed by a single quotes inside the string wherever needed.

var str = 'Hello and Welcome to the \'Strings\' in JavaScript';
alert(str);

Output of both of the above codes : Hello and Welcome to the 'Strings' in JavaScript

Converting the Case of a String Value

 

Converting to Uppercase - This can be achieved by using toUpperCase() Function of JavaScript

 

var str = "hello";
alert(str.toUpperCase());

Output : HELLO

Code for Converting to Lowercase - This can be achieved by using toLowerCase() Function of JavaScript

var str = "HELLO";
alert(str.toLowerCase());

Output : hello

To find the Length of the String, use length() function of JavaScript

alert("Hello".length);

Output : 5

var str = "Hello";
alert(str.length);

Output : 5

trim() Function of JavaScript is used to remove extra spaces from the string.

var str1 = " Hello ";
var str2 = " World ";
var result = str1.trim() + str2.trim();
alert(result);

Output : HelloWorld