What is Array in JavaScript

Arrays:

• In JavaScript an arrays is an ordered collection data or values,also know as elements.
• Is assigned numeric position in the array called its index.The index start at 0. So the 1st element position is 0 and second element position is 1 and so on.

Why we use array?

• If you have list of items (list of cars names for example) storing the cars single variables could look like this

let car1 ="Saab"
let car2 ="Volvo"
let car3 = "BMW"

• However,what if you want to loop through the cars and find the specific one? And what if you had not 3 cars,but 300?
• So the solution is Array [] An array can hold many value under the single name variable,and you can access the value by referring to an** index number**

Example:
*`Creating the empty array *

1. let a=[] console.log(a) //[]`

`Creating an Array and Initializing with Values

1. let b=[10,20,30,40] console.log(b) //[10,20,30,40]`

3. let a = ["HTML", "CSS", "JS"];
console.log(a[0]); //HTML 0 index position
console.log(a[1]);//CSS 1index position

4. let a = ["HTML", "CSS", "JS"];
Accessing Last Array Elements
let list = a[a.length - 1];//JS

**5. Replace CSS instant of Bootstrap Array Elements**
let a = ["HTML", "CSS", "JS"];
 a[1] ="Bootstrap"
 console.log(a) // [ 'HTML', 'Bootstrap', 'JS' ]

**6. Add the element to the end of array**
let a = ["HTML", "CSS", "JS"];
a.push("Node.js")
 console.log(a) // [ 'HTML', 'Bootstrap', 'JS',Node.js ]

**7.Add the element to the beginning** 
let a = ["HTML", "CSS", "JS"];
a.unshift("Web development ")
 console.log(a) // [ Web development ,'HTML', 'Bootstrap', 'JS',Node.js ]

**8. Check the Type of an Arrays**
let a = ["HTML", "CSS", "JS"];
console.log(typeof a)// Object

**9. Check the an Arrays length**
let a = ["HTML", "CSS", "JS"];
let length =a.length
consloe.log (length) // 3

10. Removing Elements from an Array
Remove the elements from an array we have different methods like pop(), shift(), or splice().

1. The pop() method removes an element from the last index of the array.
2. The shift() method removes the element from the first index of the array.
3. The splice() method removes or replaces the element from the array.