From bf6a10e2cd520a7ee553d913976f08d6eaab5ee4 Mon Sep 17 00:00:00 2001
From: jbranchaud <jbranchaud@gmail.com>
Date: Fri, 6 Dec 2024 14:45:33 -0600
Subject: [PATCH] Add Combine Two Slices as a Go TIL

---
 README.md                |  3 ++-
 go/combine-two-slices.md | 51 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 1 deletion(-)
 create mode 100644 go/combine-two-slices.md

diff --git a/README.md b/README.md
index 31216c2..e3ba4ca 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1529 TILs and counting..._
+_1530 TILs and counting..._
 
 ---
 
@@ -399,6 +399,7 @@ _1529 TILs and counting..._
 
 - [Access Go Docs Offline](go/access-go-docs-offline.md)
 - [Build For A Specific OS And Architecture](go/build-for-a-specific-os-and-architecture.md)
+- [Combine Two Slices](go/combine-two-slices.md)
 - [Do Something N Times](go/do-something-n-times.md)
 - [Find Executables Installed By Go](go/find-executables-installed-by-go.md)
 - [Not So Random](go/not-so-random.md)
diff --git a/go/combine-two-slices.md b/go/combine-two-slices.md
new file mode 100644
index 0000000..b280ea7
--- /dev/null
+++ b/go/combine-two-slices.md
@@ -0,0 +1,51 @@
+# Combine Two Slices
+
+The `append` function can be used to create a new slice with the contents of
+the given slice and one or more items added to the end.
+
+We can add one or more items like so:
+
+```go
+s1 := []int{1, 2, 3, 4}
+s2 := append(s1, 5)
+s3 := append(s2, 6, 7, 8)
+
+fmt.Println(s1) //=> [1 2 3 4]
+fmt.Println(s2) //=> [1 2 3 4 5]
+fmt.Println(s3) //=> [1 2 3 4 5 6 7 8]
+```
+
+But what if we have a second slice instead of individual items? We could import
+`slices` and use its `Concat` function. Or we can stick with `append` and
+unpack that slice as a series of arguments into the second part of `append`
+using `slice...`.
+
+```go
+s4 := append(s2, s1...)
+fmt.Println(s4) //=> [1 2 3 4 5 1 2 3 4]
+```
+
+Here is the full example:
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	s1 := []int{1, 2, 3, 4}
+	s2 := append(s1, 5)
+	s3 := append(s2, 6, 7, 8)
+
+	fmt.Println(s1)
+	fmt.Println(s2)
+	fmt.Println(s3)
+
+	s4 := append(s2, s1...)
+	fmt.Println(s4)
+}
+```
+
+[source](https://pkg.go.dev/builtin#append)