Use a for loop to modify and store iterations of same array

Question

I'm trying to use a for loop to modify an array then store that modification in another array than do another modification and store that to the second array etc, but my second array is just d instances of the last iteration of my for loop. This seems like a closure problem but I can't figure out a workaround?

for (var d=1; d<arr1.length; d++) {
       remove = arr1.splice(d,1).toString(); 
        arr1.splice(d+1,0,remove);
     arr2.push(arr1);
   }
    return arr2;

I'm starting out with [1,2,3,4] as arr1 and I'm hoping to have arr2 end up as [[1,2,3,4],[1,3,2,4],[1,3,4,2]]. I think I need to change d<arr1.length to d<arr1.length-1 but that still doesn't solve my problem - I keep getting 4 sets of [1,3,4,2] as my result — Keli
– Keli, Commented Feb 2, 2017 at 22:06

minorcaseDev · Accepted Answer · 2017-02-02 21:55:03Z

0

If you want to store all modified versions of your array, I suggest using an array of arrays, in this case let's call that top-level array master. Each time you modify your array, you would just push it to the master array.

This would give you what is called a "2d array". Then you would be able to access any version of your array that you wanted to. Your first array would be master[0], second would be master[1], etc. To access the first element of your second array, you can then just say master[1][0].

Hope this helps!

answered Feb 2, 2017 at 21:55

minorcaseDev

1915 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Keli Over a year ago

I was trying to do that by pushing arr1 to arr2 each time?

minorcaseDev Over a year ago

I know your problem now. Arrays are reference objects. Read up on this stackoverflow.com/questions/1686990/…

minorcaseDev Over a year ago

And this @keli docstore.mik.ua/orelly/webprog/jscript/ch04_04.htm

Collectives™ on Stack Overflow

Use a for loop to modify and store iterations of same array

1 Answer 1

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related