JavaScript array is an object that store a collection of multiple values of different types under a single name. 

Remember in JavaScript arrays are not primitive ( means of value type of datatype like integer, float, double or characters).

JavaScript Array  has following characteristics:

  • JavaScript arrays are resizable and can contain a values of different data types.
  • JavaScript arrays are zero-indexed: array elements are accessed using index value and the first element of the array is at index 0,  the second is at 1 and so on, and the last element is at the total length of array   minus 1.
  • JavaScript array  are not associative arrays, so element can not be accessed using strings as indexes (non negative integers)

Creating An Array

Array can be created in two ways:

  1.  Using an array literal
const colors= ["red", "green"];

2. Using new keyword

const colors= new Array ("blue", "orange")
					const colors = ['red', 'blue', 'yellow'];

// More examples

// empty array
const myArray = [ ];

// array of numbers
const numberArray = [ 10, 20,30, 40];

// array of strings
const stringArray = [ 'Kaushal', 'Kishan', 'Megha'];

// array with mixed data types
const mixData = ['India', 'USA', 1, true];

In JavaScript array  can also store objects, functions and arrays. for example

					const myArray = [
    {'name': 'kaushal'},
    [1, 2 ,3],
    function hello() { console.log('hello')}

Array length property

The  length property returns the number of elements in an array and can also set the length of an array. array.length will return total number of element in an array and array.length= 5 set the length of array to 5. 

Accessing Array Elements

We can access array elements using indices 0,1,2 …

const myArray = ['h', 'e', 'l', 'l', 'o'];

// first element
console.log(myArray[0]);  // "h"

// second element
console.log(myArray[1]); // "e"

For Detail video for array & JavaScript-

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