I'm trying to swap two elements in a list, not really sure why mines not working.

The correct implementation should do the following:

list_swap_val ([5;6;7;3],7,5) => [7;6;5;3]
list_swap_val ([5;6;3],7,5) => [7;6;3]



Mine code currently does:

list_swap_val([0,1,2,3,4,5,6,7,8], 1, 3) => [8,7,6,3,2,5,4,1,0]

I know that it reverses the list because of the fold, but I can't seem to get it to reverse the correct elements.

I don't know Ocaml, but if there isn't a built in function for this, you can always do something cheesy like copy the 2 values each to a separate variable, then rebuild/edit the list (like the following pseudo code):



This post was edited by Azrad on Jul 3 2013 11:23am