Add a `unique` function.

1 files changed, 1 insertions, 0 deletions

diff --git a/builtin.c b/builtin.c
index 43cfe267..a3c1f78b 100644
--- a/builtin.c
+++ b/builtin.c
@@ -295,6 +295,7 @@ static const char* jq_builtins[] = {
   "def select(f): if f then . else empty end;",
   "def sort_by(f): _sort_by_impl(map([f]));",
   "def group_by(f): _group_by_impl(map([f]));",
+  "def unique: group_by(.) | map(.[0]);",
 };