Arrays and basic functions associated with Array in JavaScript

About Arrays in JavaScript:

An array is a list of elements which is to store a large amount of element under a single name. The length of the array in JavaScript is not fixed.

=> Let's define an array with numbers stored form 1 to 5.

let number = [1, 2, 3, 4, 5];

=> You can define an array with string elements.

let animal = ["dog", "Cat", "monkey", "tiger"];

=> We can also define an array with mixed elements.

let data  = [1, 2, "hello", 4];

How to access any index element in JavaScript:

For example, we want to access the second element of the data array;

we will use 

data[1]; 

because of indexing in javascript array start from 0.

Now let's perform some operation on arrays by using build-in methods;

1. Length of the array:

' let numbers = [1, 2, 3, 4];
numbers.length; 

// 4

2. Map function to loop over the array and perform an action on each element in this case double all element and store it in the new array:

let numbers = [1, 2, 3, 4];

let doubleNumbers =  numbers.map(function(num) {




    return 2 * num;

});

console.log(doubleNumbers);

// [2. 4. 6. 8]

So, in the above map function, we are performing the anonymous function which is doubling all the element and returning it to doubleNumbers.

3. Adding a new element at the end of the array (push function):

let numbers = [1, 2. 3. 4];/div>




numbers.push(5);




console.log(numbers);

// [1, 2, 3, 4, 5];

4. Remove element from the end of Array (pop function):

let numbers = [1, 2, 3, 4];

numbers.pop();

console.log(numbers);

// [1, 2, 3]