JavaScript join function explained with examples

A large number of websites still use JavaScript as a client-side programming language. Here we have a guide about JavaScript join function. JavaScript was basically designed as a client-side scripting language.

They can further use JavaScript to make the pages of the website interactive, respond to users in a very short time, and create user-friendly interfaces, without less server interaction and reduce the server load.

It further executes the JavaScript code efficiently through the V8 JavaScript engine. The built-in libraries provided by Node.js further allow developers to run their web applications smoothly without depending on external web servers.

Hence, web developers can use Node.js to write both client-side and server-side code in one language JavaScript.

Also read: Best JavaScript Frameworks trending now

The web programmers can easily extend the functionality and features of JavaScript by using various libraries and frameworks.

The fully-featured JavaScript libraries like AngularJS and Ember allow JavaScript web developers to add functionality and features to complex web applications without writing or using additional code.

At the same time, lightweight JavaScript libraries like React.js and frameworks like react-native make it easier for programmers to complete specific tasks.

As mentioned earlier, JavaScript has come with some of the advanced features provided by modern programming languages like multithreading capability and file read/write options.

But the programming language has been day to day evolving consistently to meet the emerging trends in web application development.

For example, ES06, the latest release of JavaScript simplifies the modern and advanced web application development by providing so many new modules, module loaders, generators, and symbols, along with API and Unicode support.

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Problem with javascript

If you are a  modern web developer then you have to use JavaScript to make their web applications deliver optimal user experience across various devices, operating systems, and browsers.

However, they have to be familiar with various types of JavaScript libraries, frameworks, and tools. They can also combine multiple libraries and frameworks to enhance and extend JavaScript functionality and features according to the requirements of large projects.

Now in this article, we are going to teach about how we can declare a javascript array and how we can apply a join method on to them. How to combine all the elements of an array in a single element and separate them as we want

How to use Javascript join array

Javascript join array method returns a string and you can pass a separator in the function like suppose you have an array of elements like your friends name john, Sarah, tosh, torrent.  You want them in a single string and you want your friend’s name must be separated by a comma or an underscore or any of the separators.

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Then you have to apply javascript join() function to that array and join function will combine all the elements of the array and return as a string separated by a separator that you passed into the array.

Here is the explanation of the code.

Lets now define an array containing the name of your friends.

const elements = ['john', 'Sarah', 'tosh',torrent];

Syntax of the join function

You can apply to join function like this.

elements.join()

console.log(element.join('-')));

And now the expected output

“john-Sarah-tosh-torrent”

Most of the programming languages provide String as a basic data type. The main thing is that you have to know about the programming language you are working with, whether the String data type of your language is Mutable or Immutable.

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For example, Java and Python have String types that are Immutable. If you try to treat an immutable String as mutable it will throw an error and you may be confused.

Now we have seen a lot more things about javascript now the important part of the join() function is when we do not specify a separator to the join() function. Then join function combines all the elements of the array and the element will be separated by comma by default.

Now let us write a full working example of join () method for better understanding.

<!DOCTYPE html>

<html>

<body>

<p>after cicking the button you can combine the element in to String.</p>

<button onclick="Function()"> call it</button>

<p id="ccc"></p>

<script>

function Function() {

var cities = ["new york ", "africa", "india", "russia", “china”];

var com = document.getElementById("ccc");

com.innerHTML = cities.join();

}

</script>

</body>

</html>

Output

New york, africa, india, russia, china

Now here the explanation of the code

Firstly we created a button on to the web page and as soon as we press the button the function will call and then the function will call the join method that we defined.

Also read: JavaScript String Includes and How To Use Examples

I think you have noticed the most important part that we have not specified a separator to the join() function and it separated it by comma by default.

<!DOCTYPE html>

<html>

<body>

<p>after cicking the button you can combine the element in to String.</p>

<button onclick="Function()">call it</button>

<p id="ccc"></p>

<script>

function Function() {

function Function() {

var cities = ["new york ", "africa", "india", "russia", “china”];

var com = document.getElementById("ccc");

com.innerHTML = cities.join(or);

}

</script>

</body>

</html>
Output
New york or africa or india or russia or china

Now you are thinking that why i copy and paste the previous code. Dont worry the next example is about to specify the separtor to the join() function.

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We specify the separator< or> to the join function.

The split() method and the join () method

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Now let’s talk about the split method it is purely opposite to the join() method in join() method we combine the elements of the array while in the split method we split the string into the array.

Here is the syntax of the split() method.

string.split (separator, limit)

Now let’s just say you have the following string

Var XYZ = “hello world happy coding”

Now we are going to apply split () method on to that string

Var split = XYZ.split(“”)

Output

Hello, world, happy, coding

This data is stored in an array.

Conclusion

It is so simple to understand that join() function combines the elements of the array. While split() function splits the string and stores them into the array.

And if you clearly understand one method and know the working of the function then you can use as so many functions of the array that you want.

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