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* Builtin functions head' and tail' to return the head and tail of

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list.  Useful for lots of things, such as implementing a fold
  function (see NIX-30, example is in tests/lang/eval-okay-list.nix).
This commit is contained in:
Eelco Dolstra 2006-09-22 14:46:36 +00:00
parent 8a1ab709a4
commit c02a44183f
3 changed files with 39 additions and 0 deletions
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1
tests/lang/eval-okay-list.exp Normal file
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Str("foobarblatest")

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tests/lang/eval-okay-list.nix Normal file
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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"];
}