Remove tangential text from if slide (#1840)

book.toml

@@ -233,6 +233,8 @@ use-boolean-and = true
 'unsafe/extern-functions.html' = '../unsafe-rust/unsafe-functions.html'
 'unsafe/unsafe-traits.html' = '../unsafe-rust/unsafe-traits.html'
 'exercises/day-3/safe-ffi-wrapper.html' = '../../unsafe-rust/exercise.html'
+'hello-world/hello-world.html' = '../types-and-values/hello-world.html'
+'control-flow-basics/conditionals.html' = 'if.html'
 
 [output.exerciser]
 output-directory = "comprehensive-rust-exercises"

src/SUMMARY.md

@@ -30,7 +30,7 @@
   - [Exercise: Fibonacci](types-and-values/exercise.md)
     - [Solution](types-and-values/solution.md)
 - [Control Flow Basics](control-flow-basics.md)
-  - [Conditionals](control-flow-basics/conditionals.md)
+  - [`if` Expressions](control-flow-basics/if.md)
   - [Loops](control-flow-basics/loops.md)
     - [`for`](control-flow-basics/loops/for.md)
     - [`loop`](control-flow-basics/loops/loop.md)

src/control-flow-basics/if.md

@@ -2,17 +2,7 @@
 minutes: 4
 ---
 
-# Conditionals
-
-Much of the Rust syntax will be familiar to you from C, C++ or Java:
-
-- Blocks are delimited by curly braces.
-- Line comments are started with `//`, block comments are delimited by
-  `/* ... */`.
-- Keywords like `if` and `while` work the same.
-- Variable assignment is done with `=`, comparison is done with `==`.
-
-## `if` expressions
+# `if` expressions
 
 You use
 [`if` expressions](https://doc.rust-lang.org/reference/expressions/if-expr.html#if-expressions)
@@ -21,8 +11,8 @@ exactly like `if` statements in other languages:
 ```rust,editable
 fn main() {
     let x = 10;
-    if x < 20 {
-        println!("small");
+    if x == 0 {
+        println!("zero!");
     } else if x < 100 {
         println!("biggish");
     } else {