Javascript Array: The Basics of Arrays in Code

An array is a container that holds multiple values of the same type. It’s similar to a variable in that it stores data, but an array can store data of the same type in one place instead of having to create separate variables for each piece of data. An array is also referred to as an indexed list or a vector. They are all essentially the same thing and serve the same purpose, but you may hear them called by different names depending on which programming language you’re using. An Array is a collection of items that have the same type and are accessed through an index. Arrays are often used to keep track of related information so that it can be accessed quickly and efficiently. This article covers the basics

Create an Array

You create an array with a bracket ( “{“ ), a comma ( “,” ), and then the name of the type of data that will be stored in the array. You can add as many items as you want inside the square brackets, but you will have to specify the number of items in the array when you refer to that data.

Access Items in an Array

You access the data in an array using an index. An index is a number that is used to identify a particular item in an array. For example, if you have an array that holds names and phone numbers and you want to know the phone number for John Doe, you would go to the index for John Doe’s name and then go to the index for his phone number.

Change the Data in an Array

To change the data in an array, you need to know what item in the array you want to change and the new data that you want to store in that item. Since an index is used to identify data in an array, you can change an item’s data by going to its index and replacing the data in that spot with whatever you want.

Arrays are Fixed Size

Arrays are fixed size, which means that once you define an array with a specific amount of items, you can’t add to it. Although this seems like a disadvantage, it’s actually a feature because it keeps you from adding too many items to an array, which can become confusing. You can change an array’s size, but you can’t add to it once it’s been set. You can either reduce the size of an array if it has too many items or create a new array to store the extra data if the data you want to store doesn’t fit into the original array.

JS Array Functions

Arrays have many functions that you can use to manipulate them and create useful programs. Here are a few of the most common. – forEach() – This function will go through each item in the array and execute a function that you specify for each item. – filter() – This function will filter any items from the array that don’t meet the criteria that you specify. – map() – This function will create a new array by applying a function to each item in the original array. – reduce() – This function will reduce the array down to one value that is determined by applying a function to each item in the array.

JavaScript Array Conclusion

Arrays are an incredibly useful tool in programming because they allow you to store and access data efficiently, no matter how much data you have. Furthermore, they allow you to store data of any type in one place, which can be particularly helpful if you have data that is related and needs to be accessed together.

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