tvl-depot/tests/lang/eval-okay-list.nix
Eelco Dolstra c02a44183f * Builtin functions head' and tail' to return the head and tail of
list.  Useful for lots of things, such as implementing a fold
  function (see NIX-30, example is in tests/lang/eval-okay-list.nix).
2006-09-22 14:46:36 +00:00

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Nix

let {
fold = op: nul: list:
if list == []
then nul
else op (builtins.head list) (fold op nul (builtins.tail list));
concat =
fold (x: y: x + y) "";
body = concat ["foo" "bar" "bla" "test"];
}