How to print the position and value of a nested array using recursion in Javascript

Question

I have a simple question

have a nested list using recursion I have to print all the nested array as well as the value of main array .

In-put

var list = ['a', ['a','b','c',['a','b','c']],'b', 'c'];
printList('foo',list);

Out-put

foo.0.a
foo.1.0.a
foo.1.1.b
foo.1.2.c
foo.1.3.0.a
foo.1.3.1.b
foo.2.b
foo.3.c

But I am able to print only till one level deep

var list = ['a', ['a','b','c',['a','b','c']],'b', 'c'];
			var printList = function(name,list){

				 for(var i=0;i< list.length;i++){

				 	   if(Array.isArray(list[i]))
				 	   	   {
				 	   	   		printList(name+'.'+i,list[i]);

				 	   	   }
				 	   	   else{

				 	   	   	   document.write(name+'.'+i+'.'+list[i]+'<br/>');
				 	   	   	
				 	   	   }
				 	   	   	
				 }
			}

			printList('foo',list);

I have added the code snippet have a look

Thanks

Possible duplicate of Access / process (nested) objects, arrays or JSON — Teemu
– Teemu, Commented Jul 29, 2016 at 10:21
@VisioN its not printing all the element of the array , If you see it is printing only till the end of the first array that is foo.1.x.vlaues it did not print foo.2.0.b and foo.3.0.c — Vikram Anand Bhushan
– Vikram Anand Bhushan, Commented Jul 29, 2016 at 10:22
@Teemu I am beginner in js do not understand how that question is related with my question — Vikram Anand Bhushan
– Vikram Anand Bhushan, Commented Jul 29, 2016 at 10:33
Undeclared variables assignment binds it to the global scope,typical JS — Shintu Joseph
– Shintu Joseph, Commented Jul 29, 2016 at 10:37

Arathi Sreekumar · Accepted Answer · 2016-07-29 10:36:58Z

2

This is because the i in the for loop became a global variable, making it loose its value once in the recursion.

add var i; declaration before for loop in the function and the issue should be solved.

var list = ['a', ['a','b','c',['a','b','c']],'b', 'c'];
    var printList = function(name,list){
        var i;
        for(i=0;i< list.length;i++) {
            if(Array.isArray(list[i])) {
                printList(name+'.'+i,list[i]);
            } else {
                  document.write(name+'.'+i+'.'+list[i]+'<br/>');
            }
        }
    }

    printList('foo',list);

edited Jul 29, 2016 at 10:36

answered Jul 29, 2016 at 10:33

Arathi Sreekumar

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