What is importance of startsWith() method in JavaScript?

Javascript Object Oriented Programming Front End Technology

To know Whether a string starts with a particular character or a string indexOf() method is used. But in the advanced applications, this method is obsolete. So, ES6 has provided us with startsWith() method to perform those advanced tasks.

In the following example, the IndexOf() method is used to find whether the string is started with a particular character or not.

Example

Live Demo

<html>
<body>
<script>
   var text = 'Tutorialspoint'
   document.write(text.indexOf('T') === 0);
</script>
</body>
</html>

Output

true

In the following example, instead of indexOf() method, startsWith() method is used to find whether the string is started with a particular string or not.

Example

Live Demo

<html>
<body>
<script>
   var text = 'Tutorialspoint'
   document.write(text.startsWith('Tu'));
</script>
</body>
</html>

Output

true

We can also send an index to search for a particular string whether it is there at that particular position or not.

In the following example, Indexes were sent as an argument to the startsWith() method to find out whether particular strings are at those particular indexes or not.

Example

Live Demo

<html>
<body>
<script>
   var text = 'Tutorialspoint'
   document.write(text.startsWith('Tut', 0));
   document.write("</br>");
   document.write(text.startsWith('ut', 1));
   document.write("</br>");
   document.write(text.startsWith('t', 2));
</script>
</body>
</html>

Output

true
true
true

Vineeth.mariserla

Published on 19-Jul-2019 15:29:01

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