Bootstrap Breakpoints

JavaScript String

The String global object is a constructor for strings, or a sequence of characters.

There are 2 ways to create string in JavaScript

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

1) By string literal

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

2) By string object (using new keyword)

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

var stringname=new String("string literal");  

JavaScript String Methods

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

• charAt(index)

he JavaScript String charAt() method returns the character at the given index.
var str="javascript";  
document.write(str.charAt(2)); 

• concat(str)

The JavaScript String concat(str) method concatenates or joins two strings.
var s1="javascript ";  
var s2="concat example";  
var s3=s1.concat(s2);  
document.write(s3);  

• indexOf(str)

The JavaScript String indexOf(str) method returns the index position of the given string.
var s1="javascript from javatpoint indexof";  
var n=s1.indexOf("from");  
document.write(n);  

• lastIndexOf(str)

The JavaScript String lastIndexOf(str) method returns the last index position of the given string.
var s1="javascript from javatpoint indexof";  
var n=s1.lastIndexOf("java");  
document.write(n);  

• toLowerCase()

The JavaScript String toLowerCase() method returns the given string in lowercase letters.
var s1="JavaScript toLowerCase Example";  
var s2=s1.toLowerCase();  
document.write(s2);  

• toUpperCase()

The JavaScript String toUpperCase() method returns the given string in uppercase letters.
var s1="JavaScript toUpperCase Example";  
var s2=s1.toUpperCase();  
document.write(s2);  

• slice(beginIndex, endIndex)

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.
var s1="abcdefgh";  
var s2=s1.slice(2,5);  
document.write(s2);  

• trim()

The JavaScript String trim() method removes leading and trailing whitespaces from the string.
var s1="     javascript trim    ";  
var s2=s1.trim();  
document.write(s2);