JavaScript String Functions With Example

By: Prem Tiwari | Last Updated: October 20, 2017 | In: Javascript & Ajax, Web Technologies

JavaScript short name (JS) is a dynamic programming language. It can provide the dynamic interactivity on websites when it applied with HTML documents.

It was developed by Brendan Eich, co-founder of the Mozilla project, the Mozilla Foundation, and the Mozilla Corporation.

javasrcipt functions

Below is the list of JavaScript string functions.

String Function

Example

trim()

var s1="FreeWeb Mentor";

var s2=s1.trim();

document.write(s2);

charAt(index)

1 2	var myString = 'jQuery FTW!!!'; console.log(myString.charAt(7));

concat(str)

var message="Hello"

var finalWord=message.concat("This is a"," Cat.")

//output: Hello This is a Cat

alert(finalWord);

lastIndexOf(str)

var myString = 'FreeWeb Mentor';

//Output is 13

console.log(myString.lastIndexOf('r'));

indexOf(str)

var sentence="Hi, my name is Prem!"

if (sentence.indexOf("Prem")!=-1)

alert("Prem is in there!");

toLowerCase()

var s1="Javascript Example";

var s2=s1.toLowerCase();

alert(s2);

toUpperCase()

var s1="Javascript Example";

var s2=s1.toUpperCase();

alert(s2);

slice(beginIndex, endIndex)

var text="freewebmentor";

text.slice(0,6); //returns "freewe"

text.slice(2,6); //returns "eewe"

split(delimiter, [limit])

1 2	var message="Welcome to FreeWebMentor!" var word=message.split("l")

About: Prem Tiwari

Prem Tiwari is the founder of FreeWebMentor.com and also a professional developer who has vast experience in PHP and open source technologies. Apart from this, he is a blogger by hobby and also he has been a regular speaker of WordPress sessions in various IT Companies. View all posts by Prem Tiwari

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