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Programming-Idioms

  • Lisp
  • C++
  • Haskell

Idiom #226 Delete last element from list

Remove the last element from the list items.

let items2 = init items

The init function is unsafe. It blows up if a list (or string) is empty.
pop :: [a] -> [a]
pop [] = []
pop xs = init xs

let items2 = pop items

This is safer than init.

pop [1,2,3] ~~> [1,2]
pop [] ~~> []
pop "abcd" ~~> "abc"
pop "" ~~> ""
items.pop_back();

Removes last element from items, without returning anything.

If items is already empty, then behaviour is undefined.
with Ada.Containers.Vectors;
Items.Delete_Last (Count => 1);
New implementation...
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let items2 = init items
pop :: [a] -> [a]
pop [] = []
pop xs = init xs

let items2 = pop items
items.pop_back();
Items.Delete_Last (Count => 1);

(drop-last items)
items.RemoveAt(items.Count - 1);
items.removeLast();
items = items(1:size(items)-1)
items = items[:len(items)-1]
items = slices.Delete(items, len(items)-1, len(items))
items.pop();
items.remove(items.size() - 1);
items.removeLast();
items = copyOfRange(items, 0, items.length - 1);
int n, t[] = new int[n = items.length - 1];
arraycopy(items, 0, t, 0, n);
items = t;
array_pop($items);

items.delete(items.count-1);
pop(@items);
items.pop()
items.pop
items.pop();