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Sunday, June 20, 2021

Joining Arrays in JavaScript – Linux Hint

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In JavaScript, as in many other scripting and programming languages, we often need to use arrays. Furthermore, it is often useful to combine the elements of an array into a single string. In PHP, for example, the implode function is used to join the elements of an array. In this context, “implode” can be viewed as a synonym for “join”. In JavaScript, however, there is no “implode” function; instead, there is a built-in “join” function that performs the same task. In this article, we are going to examine JavaScript’s join function in some detail.


The join function concatenates the elements of an array into a single string. The syntax for the join function is as follows:

Here, separator is the string or string used to separate elements of the array; it can be any character or string, such as the space character (i.e., “ ”) or a string like “xyz”, but a comma is used as the default.


Now, let’s look at some examples.

First, we declare an array of letters.

let arr = [“a”, “b”, “c”, “d”, “f”]

We can call the join function for this array without providing a separator as follows, which will return the all characters from the array separated by commas:

Now, let’s see what will happen if we provide the space character as a separator:

Here, in the string returned, the array elements are separated by the space character instead of a comma.

We can provide any character or string as a separator. If we want to put “ and ” between the array’s elements, we can do that as follows:

Here, every alphabet is separated by the “ and ”, which might be very useful for certain applications. Any string can be provided as a separator for joining an array’s elements in the same way.


This article explains JavaScript’s join function and provides some useful examples. We can provide any string we want as a separator to join an array’s elements.

We hope you found this article useful and continue using linuxhint.com to learn about JavaScript.

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