From 13e6454d3d88bb509bb54c467fbda3637899d0ca Mon Sep 17 00:00:00 2001
From: Anders Olsson <anders.e.olsson@gmail.com>
Date: Mon, 12 Dec 2022 10:50:59 +0100
Subject: [PATCH] Update crates and added methods to get a key or all keys in
 an IndexMap

---
 Cargo.toml |  6 +++---
 src/lib.rs | 11 +++++++++++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 91210be..d579204 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,9 +7,9 @@ edition = "2021"
 approx = { version = "0.5.1", optional = true }
 
 [dev-dependencies]
-plotters = { version = "0.3.1", default-features = false, features = ["svg_backend", "all_elements", "all_series"] }
-plotters-backend = "0.3.2"
-time = { version = "0.3.9", features = ["parsing"] }
+plotters = { version = "0.3.4", default-features = false, features = ["svg_backend", "all_elements", "all_series"] }
+plotters-backend = "0.3.4"
+time = { version = "0.3.17", features = ["parsing"] }
 trueskill-tt = { path = ".", features = ["approx"] }
 
 [profile.release]
diff --git a/src/lib.rs b/src/lib.rs
index 1fc6b7b..1890230 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -77,6 +77,17 @@ where
             idx
         }
     }
+
+    pub fn key(&self, idx: Index) -> Option<&K> {
+        self.0
+            .iter()
+            .find(|(_, &value)| value == idx)
+            .map(|(key, _)| key)
+    }
+
+    pub fn keys(&self) -> impl Iterator<Item = &K> {
+        self.0.keys()
+    }
 }
 
 impl<K> Default for IndexMap<K>