6 most commonly used methods and how they’re implemented. Arrays are a structure common to all programming languages so knowing what they are and having a firm grasp on what you’re able to accomplish with Arrays will take you a long way in your journey as a software developer.
In this post I’ll be covering how to perform the create, read update and delete operations using arrays, some common functions that come with the Array prototype and also how to implement them.
Before we jump into the juicy bits of Arrays, lets quickly gloss over what they are. Arrays
Array.prototypethat includes a wide variety useful functions that can be called from arrays or
If you’re not familiar with the term CRUD it stands for Create, Read, Update and Delete. In this section we’ll go through each one of these operations and cover different ways you can perform each one.
There are several ways you can create an Array but the most common ways are by using
Lets take a look at each one with examples
The array literal is the most common way of creating an array. It uses the square brackets as a notion of a container followed by comma separated values inside the square brackets. The following examples show how to use the array literal syntax and how arrays are untyped i.e. can contain elements of different types.
Another way to create an array is through the Array constructor.
const myArray = new Array();
Using the Array constructor, as shown above, is the same as creating an array with the array literal syntax. i.e.
// The following two lines behave exactly the same way i.e. both create an empty arrays const myArray = new Array(); const myOtherArray = ;
The array constructor, however, is able to receive arguments that allow it to behave in different ways depending on the number and type of arguments passed to it.
const myArray = new Array(5);
Note: If you want to define the array with a specified size, as shown above, the argument passed _**_must**_ be a numeric value. Any other type would be considered as the first element that’ll be placed in the array._
Or you can pass two or more arguments or a non-numeric argument to place the values inside the array. This works the same way as shown in the array literal examples.
As stated earlier, these two ways are the most common ways of creating arrays that you’ll see and use 99% of the time. There are a few other ways but we won’t dive deep into how they work. They are
const someArray = […someOtherArray]
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There are various ways to add or append an item to an array. We will make use of push, unshift, splice, concat, spread and index to add items to array. Let's discuss all the 6 different methods one by one in brief.
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By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity. Let’s see them together one by one with some amazing examples.