From ae85fab3c378726e84bc362effde97606eab0a71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robert=20Paj=C4=85k?= <rpajak@splunk.com>
Date: Wed, 12 May 2021 03:28:46 +0200
Subject: [PATCH] Document functional options (#1899)

* Document functional options

* Update CONTRIBUTING.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

* Update CONTRIBUTING.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>
---
 CONTRIBUTING.md | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index f11608b5e..83ea23b1c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -294,6 +294,23 @@ func WithMyType(t MyType) Option {
 }
 ```
 
+##### Functional Options
+
+```go
+type optionFunc func(*config)
+
+func (fn optionFunc) apply(c *config) {
+	fn(c)
+}
+
+// WithMyType sets t as MyType.
+func WithMyType(t MyType) Option {
+	return optionFunc(func(c *config) {
+		c.MyType = t
+	})
+}
+```
+
 #### Instantiation
 
 Using this configuration pattern to configure instantiation with a `NewT`