Array7.html

<h3> demo on for spread operator(...)(ECMA script)</h3>
  <script>
    
	 const x=[21,22,33];
	 let y=[...x]; // array copied
	 //y=x;  it is copying ref 
	    document.write(`X : ${x}<br>`);
		document.write(`Y : ${y}<br>`);
	const ft=['html','css','js','bs'];
	const bt=['servlet','asp.net','php'];
	const db=['oracle','sql-server'];
	
	const fs=[...ft,...bt,...db];//array merge
	document.write(`FS : ${fs}<br>`);
	 
	 const a=[...ft,'react',...bt];
	 document.write(`A : ${a}<br>`);
	   
  </script>
  <!-- >"..." is unary operator,we should use this operator as prefix.
       >Its spread operator.
	   >the spread operator represents all remaining values/so on values.
	   >this we can use in methods and arrays.
	     Syn: ...array  <-spread
		      ...collection  <-spread
			  -->