Array1.html

<!--
Arrays
-------
>Array is collection of elements (values).
>storing group of values with same refname is called array.
>array allows similar type of values (homogeneous)  as well
 as different types of values, means one array can store group
 numbers, strings, strings, booleans etc....
>we can arrays create in local scope or outer scope.
>arrays are belongs to reference/non-primitive dataype.
>in js, arrays are created dynamically, and arrays are created
 in heap area.
>arrays maintance data in sequence order

adv:
 > arrays are sumplifying coding when work with group
  of values.
 > easy transporting data
 > also used for data maintance in applications
 
array creation:
   Approach 1:
       using array Literals []
	   Syn: let/var/const array = [];
	        let/var/const array = [val1,val2,val3,...];
			
   Approach 2:
       using new kw & constructor
	   Syn: var/let/const array = new Array();
	        var/let/const array = new Array(val1,val2,...);
			
			
accessing array:
      array[index]
	      index is a slno of memory block, its start 0.

set value:
      array[index]=value;

size of array:
    array.length => predefined property, it returns
	sizi of array
	array.length=N;  => it reset size of array
-->
<h3> demo on array literal</h3>
  <script>
     //array declaration
	 let a=[];
	 document.write(`size of arr ${a.length}<br>`);
	 document.write(`arr ${a}<br>`);
	  
	  a[0]=10;//asign
	  a[1]=20;
	  a[2]=30;
	  document.write(`size of arr ${a.length}<br>`);
	 document.write(`arr ${a}<br>`);
	 
	 //array init
	 let b=[5,6,7];
	 document.write(`size of arr ${b.length}<br>`);
	 document.write(`arr ${b}<br>`);
	 
	 
  
  </script>