JavaScript string tutorial - More string manipulation functions

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In this tutorial you will learn how to use and manipulate strings in JavaScript.

Tutorial info:

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Step 3 - More string manipulation functions

JavaScript string tutorial

indexOf

Synatx: object.indexOf(searchValue[,index]); 

You can use indexOf() method to check whether a string or character is present in your main string. You can use it only with a string parameter. In this case the indexOf method returns the position where the string was found inside your main string. If there is no such sub-string then it returns with -1.

Besides this you can also use the function with 2 parameters. In this case the first is the string as before and the second is a number which tells the method from where to start the search. 

Code: 
   var str  = 'Demo Text.';
   var pos  = str.indexOf('Te');
   var pos2 = str.indexOf('Te',10);
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split

Syntax: object.split(separator); 

With split you can divide a string into more parts and the separated parts will be loaded into an array. For example you can divide a sentence into words by using split and a space character as separator.

Code: 
   var str  = 'Demo Text.';
   var words = new Array();
 
   words = str.split(' ');
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substr 

Syntax: object.substr(start[,length]); 

With substr() method you can cut one piece of the original string. The method requires 2 parameters. The first defines where you want to start the cut and the second shows how many character do you want to cut.

Code: 
   var str  = 'Demo Text.';
   var str1 = str.substr(3,4);
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substring

Syntax: object.substring(start,end); 

Similar to substr but in this case the second parameter defines not the length but the last position of the cut.

Code: 
   var str  = 'Demo Text.';
   var str1 = str.substring(3,4);
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Tags: javascript string functions, javascript string, javascript, string, function