String Object In JavaScript
String is a sequence of characters.
In JavaScript string is defined as follows-
var msg="String Object";
1.Property of String Object
| Property | Description |
|---|---|
| 1.length | Returns number of characters in a string |
| 2.prototype | Allows you to add properties and methods to an object. |
var msg="String Object";
document.write("Length of String is="+msg.length);
Output-
Length of String is=13
2.Methods of String object
| Methods | Description |
|---|---|
| 1.charAt() | Returns the character at the specified position (in number) i.e index. |
| 2.concat() | Combines two strings and returns a new string. |
| 3.indexOf() | Returns the index of the first occurence of specified charcter in string.If character is not occurs first then it returns as -1 value. |
| 4.lastIndexOf() | Returns the index of the last occurence of specified charcter in string. |
| 5.toLowerCase() | Converts the given string to lowercase |
| 6.toUpperCase() | Converts the given string to uppercase |
| 7.replace() | Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring. |
| 8.trim() | Removes whitespaces from both sides of a string. |
| 9.substr() | Returns the characters in a string beginning at the specified location through the specified number of characters. |
| 10.substring() | Returns the characters in a string between two indexes into the string. |
Example-
<!doctype html>
<html>
<body>
<script type="text/javascript">
var msg="String Object";
var msg1="in JavaScript";
var msg2=" JavaScript ";
document.write("Length of String="+msg.length+"<br>");//write number of characters
document.write("Uppercase="+msg.toUpperCase()+"<br>");//converts uppercase
document.write("Lowercase="+msg.toLowerCase()+"<br>");//converts to lowercase
document.write("substring="+msg.substring(2,9)+"<br>");//write character from position 2 to position 9
document.write("charAt="+msg.charAt(2)+"<br>");//write character at position 2
document.write("concat="+msg.concat(" ",msg1)+"<br>");//combines two strings
document.write("indexOf="+msg.indexOf("o")+"<br>");//returns -1 it not present at first occurence
document.write("replace="+msg.replace("Object","JavaScript")+"<br>");//replace object by JavaScript.
document.write("trim="+msg2.trim()+"<br>");//remove whitespaces i.e.blankspace from both side.
</script>
</html>
Output-
Length of String=13
Uppercase=STRING OBJECT
Lowercase=string object
substring=ring Ob
charAt=r
concat=String Object in JavaScript
indexOf=-1
replace=String JavaScript
trim=JavaScript
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