Must-Know JavaScript Array Methods

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If you are a programmer, you must be aware of what arrays are! Don’t you?
Arrays are one of the most useful JS functions, especially if you know how and where to use them. These are pretty simple, yet most powerful functions that can help you perform some action.
In this blog, we’ll talk about some of the most important JavaScript arrays that you must know about!
But before we get into detail about array methods, let’s see what Arrays are in JS.

What are Arrays?

The Array enables storing multiple values under a single variable name. It has other values as well for performing particular array operations.

In this post, we’ll talk about some popularly searched Array functions.

For instance, if you have a list of fruits stored in single variables could look like this:

However, if you want to perform the same function again and again, say repeat the fruits, then what would you do? And what if you had 100 fruits and not just 3?

The simple solution to this issue is an Array!

An array is a function that can hold various values under a single variable and thus making code appear simple and easy to understand.

So, an array of fruits would look like this:

So, now let’s discuss some most important JavaScript Array methods.

Array.map()

The map() prototype in JavaScript loops every element of the array and creates a new array with the outputs of a provided function.

The example of Array.map() is shown below:

Array.filter()

The filter() prototype in JavaScript creates a new array of the elements that pass the condition in the call back function.

The example of Array.filter() is shown below:

Array.some()

The some() prototype in JavaScript checks for at least one element to pass the call back function. The prototype returns with a Boolean statement if it finds an element in the prototype to be true, otherwise, it will return false.

The example of Array.some() is shown below:

Array.Sort()

The sort() prototype in JavaScript sorts all the elements in a place and returns the output in a sorted array. Well, the default sort function is ascending, but you can perform descending function as well.

The example of Array.sort() is shown below:

Array.reduce()

The reduce() prototype in JavaScript executes a “reducer” callback function and returns a single value from the calculation of the preceding element. It doesn’t return an array as the output; it returns a single output.  

The example of Array.reduce() is shown below:

Array.every()

The every() prototype in JavaScript checks whether every element in the array pass the callback function or not. It returns a boolean value as an output.

The example of Array.every() is shown below:

Array.find()

The find() prototype in the array returns with the first element in the provided callback function that satisfies the function.

The example of Array.find() is shown below:

If in case, no values satisfy the callback function, “undefined” is displayed as the output

The example of Array.find() with undefined as the result is shown below:

Array.findindex()

The findindex() prototype in JavaScript gives the first element as a result that satisfies the provided callback function. In other cases, the output is displayed as -1 if no element satisfies the provided callback function.

The example of Array.findindex() is shown below:

JS array accompanies some of the great methods that simplify our task of developing or coding. Getting detailed insights on JavaScript arrays can help us save time and even helps in boosting the performance of the site.

We hope that the above blog helped you in developing an understanding of some most important JavaScript array methods that can you use in your next project.

You can even let us know in the comments sections if you come across some great JS functions that can be simplified using the above-mentioned array methods.

Hope this article proved to be of great help to you! In case, you still have some doubts, don’t hesitate to reach out to us, our developers will be happy to assist you!

Thanks for reading!