[nix/en] document using ? to test set membership

1 files changed, 6 insertions, 0 deletions

diff --git a/nix.html.markdown b/nix.html.markdown
index ef59a135..ba122a46 100644
--- a/nix.html.markdown
+++ b/nix.html.markdown
@@ -208,6 +208,12 @@ with builtins; [
   { a = 1; b = 2; }.a
   #=> 1
 
+  # The ? operator tests whether a key is present in a set.
+  ({ a = 1; b = 2; } ? a)
+  #=> true
+  ({ a = 1; b = 2; } ? c)
+  #=> false
+
   # The // operator merges two sets.
   ({ a = 1; } // { b = 2; })
   #=> { a = 1; b = 2; }