diff options
| -rw-r--r-- | neb/std/lists.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/neb/std/lists.py b/neb/std/lists.py index 1ecbb6d..a49962b 100644 --- a/neb/std/lists.py +++ b/neb/std/lists.py @@ -130,3 +130,11 @@ def interpretSortNumbers(symbol, args, env, ns): return List(out) LISTS.register("sort-numbers", Builtin("sort-numbers", interpretSortNumbers, [Arg("list", TypeEnum.LIST)], return_type=Type(":list"))) + +def interpretPrepend(symbol, args, env, ns): + lst = args[0] + val = args[1] + items = lst.args[:] + return List([val] + items) + +LISTS.register("prepend", Builtin("prepend", interpretPrepend, [Arg("list", TypeEnum.LIST), Arg("item", TypeEnum.ANY)], return_type=Type(":list"))) |