❔ Filing empty list with equal items left and right of selected item from another list
Given a list and selected index of an item in that list, I want to fill another list such that items will try to be inserted, in order, to the left and right of that selected item without going past a given max count for the new list. A little confusing, but here's an example:
I have a list with the following strings
So essentially I try to keep the original selected item in the middle of a new list and insert items from the original list to the left and right until I hit the max. If there's not enough elements to reach the max then it's fine if it's not in the middle.
This is what I have so far, and it's fine and works, but I'm not sure if there's a more efficient way or using less for loops and if statements.
I have a list with the following strings
{ "red", "blue", "green", "yellow", "black", "brown" }3yellow{ "blue", "green", "yellow", "black", "brown" }So essentially I try to keep the original selected item in the middle of a new list and insert items from the original list to the left and right until I hit the max. If there's not enough elements to reach the max then it's fine if it's not in the middle.
This is what I have so far, and it's fine and works, but I'm not sure if there's a more efficient way or using less for loops and if statements.
int idx = originalList.IndexOf(selectedItem);
int count = 1;
newList.Add(selectedItem); // first add the selecteditem to the new list
// first try to get two elements before the selected item
int lastBeforeIndx = idx;
for (int i = idx - 1; i >= 0; i--)
{
if (count == 3)
{
break;
}
newList.Insert(0, originalList[i]);
lastBeforeIndx = i;
count++;
}
// then try to get 2 elements to the right of the selected item
for (int i = idx + 1; i <= originalList.Count; i++)
{
if (count == 5)
{
break;
}
newList.Add(originalList[i]);
count++;
}
// all finished. Only want to show five at a time in this example
if (count == 5)
{
return;
}
// if not at 5, try adding to the left again
for (int i = lastBeforeIndx - 1; i >= 0; i--)
{
if (count == 5)
{
break;
}
newList.Insert(0, originalList[i]);
count++;
}
