From 11fd2671d7021f0672a89f9ea20ec42643e693bf Mon Sep 17 00:00:00 2001
From: Federico Igne <git@federicoigne.com>
Date: Mon, 28 Dec 2020 09:42:59 +0000
Subject: [rust] ETL

---
 rust/etl/src/lib.rs | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 rust/etl/src/lib.rs

(limited to 'rust/etl/src/lib.rs')

diff --git a/rust/etl/src/lib.rs b/rust/etl/src/lib.rs
new file mode 100644
index 0000000..dd0752c
--- /dev/null
+++ b/rust/etl/src/lib.rs
@@ -0,0 +1,7 @@
+use std::collections::BTreeMap;
+
+pub fn transform(h: &BTreeMap<i32, Vec<char>>) -> BTreeMap<char, i32> {
+    h.iter()
+        .flat_map(|(k, v)| v.iter().map(move |x| (x.to_ascii_lowercase(), *k)))
+        .collect()
+}
-- 
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