Changing one list changes another one

MIT App Inventor Help
1

I am creating a program where there are 2 lists, and you could add "Hello" to one of the lists through a button. I also have a button to set the first list to the second one, and a button to reset.

However, when I click the button to set the first list to the second one, every time I added "Hello" to a list, the other list gets another "Hello" too. How do I make it so that only one list gets a "Hello"?

listset.aia (2.6 KB)

2

Use the copy list block when you set the first list to the second list, otherwise the second list will always inherit the contents of the first list.

1 Like
3

this behavior is called call by reference, see also

Taifun

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