From 32d9d1622940323ec41ae991a62cf82427e16561 Mon Sep 17 00:00:00 2001
From: Quinn Wilton <wilton@synopsys.com>
Date: Wed, 2 Dec 2020 11:29:02 -0800
Subject: Add bool.exclusive_or

---
 src/gleam/bool.gleam       | 25 +++++++++++++++++++++++++
 test/gleam/bool_test.gleam | 14 ++++++++++++++
 2 files changed, 39 insertions(+)

diff --git a/src/gleam/bool.gleam b/src/gleam/bool.gleam
index 4a9cebf..e5b079f 100644
--- a/src/gleam/bool.gleam
+++ b/src/gleam/bool.gleam
@@ -30,6 +30,31 @@ pub fn negate(bool: Bool) -> Bool {
   }
 }
 
+/// Returns the exclusive or of two bools
+///
+/// ## Examples
+///
+///    > exclusive_or(False, False)
+///    False
+///
+///    > exclusive_or(False, True)
+///    True
+///
+///    > exclusive_or(True, False)
+///    True
+///
+///    > exclusive_or(True, True)
+///    False
+///
+pub fn exclusive_or(a: Bool, b: Bool) -> Bool {
+  case a, b {
+    False, False -> False
+    False, True -> True
+    True, False -> True
+    True, True -> False
+  }
+}
+
 /// Compares two bools and returns the first values Order to the second.
 ///
 /// ## Examples
diff --git a/test/gleam/bool_test.gleam b/test/gleam/bool_test.gleam
index a05327f..aced02b 100644
--- a/test/gleam/bool_test.gleam
+++ b/test/gleam/bool_test.gleam
@@ -10,6 +10,20 @@ pub fn negate_test() {
   |> should.be_true
 }
 
+pub fn exclusive_or_test() {
+  bool.exclusive_or(True, True)
+  |> should.be_false
+
+  bool.exclusive_or(False, False)
+  |> should.be_false
+
+  bool.exclusive_or(True, False)
+  |> should.be_true
+
+  bool.exclusive_or(False, True)
+  |> should.be_true
+}
+
 pub fn compare_test() {
   bool.compare(True, True)
   |> should.equal(order.Eq)
-- 
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