JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="fnMakeArray()">Click to make an array</button>
<button onclick="fnReplicateArray()">Click to copy the array to another array</button>

<div id="parse"></div>

JavaScript

/*var A = [1, 2, 3]*/
/*var B = "hello", [1, 2, 3],
         "hello", [2, 3, 2],
         "hello", [1, 5, 1]]*/
		 
var A = new Array();
var B = new Array();

function fnMakeArray()
    {
     var strTemp;
     var arrTemp = new Array();
     strTemp = parseInt(window.prompt("Enter a number until you hit cancel",""));  
     

  while (strTemp>0)
      {
         arrTemp.push(strTemp);   
         strTemp =  parseInt(window.prompt("Enter a number until you hit cancel",""));
      }  
        A[0] = "hello";
        A[1] = arrTemp;
        alert(A);
    }


function fnReplicateArray()
    {
        B.push(A); 
        fnDisBArray();
        alert(B);
      
    }

function fnDisBArray()
{
    var strTemp="";
 for(var x = 0; x<B.length;x++)
     {
         strTemp += "<P>" + B[x] + "</p>"
       
     }
     document.getElementById('parse').innerHTML = strTemp ;  
     
    
}