Sunday, 12 June 2016

Javascript - String

JavaScript strings are used for storing and manipulating text.It is an object that represents sequence of characters.

A JavaScript string simply stores a series of characters like "John Smith".
A string can be any text inside quotes. You can use single or double quotes.

Eg:
var name= "Bob";
var name= 'Bob';

String length
Below is the code for find the length of  a string

var name = "John Smith";
var val = name.length;

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

  • charAt(index)
  • concat(str)
  • indexOf(str)
  • lastIndexOf(str)
  • toLowerCase()
  • toUpperCase()
  • slice(beginIndex, endIndex)
  • trim()
charAt ()

var str="hellowworld";
document.write(str.charAt(4)); 

output: o

concat(str)

var str1="hello";
var str2="world";
var str3=str1.concat(str2);
document.write(str3); 

output: hello world

indexOf(str)

var str1="helloworld from javascript";
var num=str1.indexOf("from");
document.write(num);  

output: 11

lastIndexOf(str)

var str1="hellowworld from javascript";
var num=str1.lastIndexOf("java");
document.write(num);  

output: 16

toLowerCase()

var str1="JavaScript toLowerCase Example";
var str2=str1.toLowerCase();
document.write(str2); 

Output: javascript tolowercase example

toUpperCase()

var str1="JavaScript toUpperCase Example";
var str2=str1.toUpperCase();
document.write(str2); 

Output: JAVASCRIPT TOUPPERCASE EXAMPLE

slice()

var str1="abcdefgh";
var str2=str1.slice(2,5);
document.write(str2); 

output: cde

trim()

var str1="     javascript trim example    ";
var str2=str1.trim();
document.write(str2); 

output: javascript trim example

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