Скачать или смотреть Access Array Elements from Any Side in JavaScript | JavaScript New Array Method Tutorial

Access Array elements from left or right side, by using array length or without using array length. There is a new Array AT method in JavaScript that simplifies accessing Array elements from end of Array. Array is a variable that can hold more than one value. Simply it's a list of items. We can take a variable with few elements and look into JavaScript Arrays and JavaScript Array Methods. We will also learn JavaScript Array new method. You will learn new things in this JavaScript array tutorial.

Here is an Array called items holding bunch of numbers
const items = [1, 2, 3, 4]
We can also take strings instead of numbers
const items = ['Apple', 'Orange', 'Peach', 'Grapes']

I can access elements in this array by using index number.
Array index starts with zero.
I will type items zero to access first element in array.

items[0]
items[1]
items[2]
items[3]

What if I want to access last element in array?
For that I will need to know length of Array (array length is number of array elements).
For that I would type items.length -1.
This would give me last item in Array.

items[items.length - 1]
Access second last element
items[items.length - 2]
This would give me 3.
items[items.length - 3]
items[items.length - 4]

To access elements from left to right we can also use at method.

items.at(0)
The at() method takes an integer value and returns the item at that index, allowing for positive and negative integers. Negative integers count back from the last item in the array.
items.at(1)
items.at(2)
items.at(3)

We can access elements from end without calculating length of Array by using at method. This is called Relative Indexing Method that is new feature in JavaScript. Relative indexing via negative indices is a feature that enjoys popularity in other languages like Python.

items.at(-1)
-1 means the last element
items.at(-2)
items.at(-3)
items.at(-4)

So Array at method simplifies things a little bit where we do not have to find length of Array to access elements from the end.

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