From 01be02f4cc9e341353e34082edc5659cf35ebf16 Mon Sep 17 00:00:00 2001
From: NaiJi <naijiworld@protonmail.com>
Date: Wed, 27 Apr 2022 05:54:34 +0000
Subject: [PATCH] Add '31.nix'

---
 31.nix | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 31.nix

diff --git a/31.nix b/31.nix
new file mode 100644
index 0000000..fdc4aa0
--- /dev/null
+++ b/31.nix
@@ -0,0 +1,15 @@
+with import <nixpkgs> { };
+let
+  attrSet = {c = 3; a = 1; b = 2;};
+  #This is an example function that extracts a single value 
+  getSingleVal = (attrSet: x: attrSet.${x});
+
+  #tips: use the map function and access the attribute values 
+  #in the same way as 'getSingleVal'
+  attrVals = l: s: map (field: s.${field}) l;
+
+in
+rec {
+  example = getSingleVal attrSet "a"; #is [1]
+  solution = attrVals ["a" "b" "c"] attrSet; #should be [1 2 3]
+}
\ No newline at end of file