JavaScript Arrays

JavaScript Arrays


JavaScript Arrays
An array is a group of memory locations that all have the same name and normally are of the same type(although this attribute is not required in JavaScript).
  • Array is a collection of same and different data types
  • Each data in array called element 
  • Each elements has a numeric position, known as its index/indices, in the array
  • The index number starts from Zero
  • In JavaScript, Array is also an object. The typeof operator will return the same 
  • Array object has length property which returns the total number of elements
  • An element may be referred to by giving the name of the array followed indexof the element in square brackets ([ ]).
Arrays Construction
  • The first element in every array is the zeroth element.
  • The element of the array c is referred to c[i-0].
  • Array names follow the same conventions as other identifiers
  • A subscripted array name 
  1. Can be used on the left side of an assignment to place a new value into an array element.
  2. Can be used on the right side of an assignment operation to use its value 
  • Every array in JavaScript knows its own length, which it stores in its length attribute and can be found with expression arrayname.length.
Declaring and allocating array
  • JavaScript arrays are Array objects
  • Creating new objects using the new operator is known as creating an instance or instantiating an object
  • Operator new is known as the dynamic memory allocation operator.
Example1- Program to creating an array stores fruits:
  
Output
Creating an Array
Using an array literal is the easiest way to create a JavaScript Array.
The Syntax of the Array is as follows:
const array_name = [item1item2, ...]; 
Example2-Creating Array with help of Using the JavaScript Keyword new:
Output