From 4ce87c54733bf78df1c926f45707304c6325fa86 Mon Sep 17 00:00:00 2001
From: "Dustin J. Mitchell" <djmitche@google.com>
Date: Thu, 23 Jan 2025 09:23:08 -0500
Subject: [PATCH] Improve tuple destructuring (#2582)
This slide had two code samples, neither of which had a `main` and thus
neither of which would run. This removes the first (which is redundant
to one a few slides earlier), adds a `main`, and expands the second to
use a 3-tuple.
---
src/tuples-and-arrays/destructuring.md | 28 +++++++++++---------------
1 file changed, 12 insertions(+), 16 deletions(-)
diff --git a/src/tuples-and-arrays/destructuring.md b/src/tuples-and-arrays/destructuring.md
index 6d5a15b7..d87674f5 100644
--- a/src/tuples-and-arrays/destructuring.md
+++ b/src/tuples-and-arrays/destructuring.md
@@ -4,25 +4,21 @@ minutes: 5
# Patterns and Destructuring
-When working with tuples and other structured values it's common to want to
-extract the inner values into local variables. This can be done manually by
-directly accessing the inner values:
-
-```rust,editable
-fn print_tuple(tuple: (i32, i32)) {
- let left = tuple.0;
- let right = tuple.1;
- println!("left: {left}, right: {right}");
-}
-```
-
-However, Rust also supports using pattern matching to destructure a larger value
+Rust supports using pattern matching to destructure a larger value like a tuple
into its constituent parts:
```rust,editable
-fn print_tuple(tuple: (i32, i32)) {
- let (left, right) = tuple;
- println!("left: {left}, right: {right}");
+fn check_order(tuple: (i32, i32, i32)) -> bool {
+ let (left, middle, right) = tuple;
+ left < middle && middle < right
+}
+
+fn main() {
+ let tuple = (1, 5, 3);
+ println!(
+ "{tuple:?}: {}",
+ if check_order(tuple) { "ordered" } else { "unordered" }
+ );
}
```