initial commit

if/README.md

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+# If
+
+`if`, the most basic (but still surprisingly versatile!) type of control flow, is what you'll learn here.
+
+## Further information
+
+- [Control Flow - if expressions](https://doc.rust-lang.org/book/ch03-05-control-flow.html#if-expressions)

if/if1.rs

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+// if1.rs
+//
+// Execute `rustlings hint if1` or use the `hint` watch subcommand for a hint.
+
+// I AM DONE
+
+pub fn bigger(a: i32, b: i32) -> i32 {
+    // Complete this function to return the bigger number!
+    // Do not use:
+    // - another function call
+    // - additional variables
+    if a > b {
+        a
+    } else {
+        b
+    }
+}
+
+// Don't mind this for now :)
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn ten_is_bigger_than_eight() {
+        assert_eq!(10, bigger(10, 8));
+    }
+
+    #[test]
+    fn fortytwo_is_bigger_than_thirtytwo() {
+        assert_eq!(42, bigger(32, 42));
+    }
+
+    #[test]
+    fn equal_numbers() {
+        assert_eq!(42, bigger(42, 42));
+    }
+}

if/if2.rs

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+// if2.rs
+//
+// Step 1: Make me compile!
+// Step 2: Get the bar_for_fuzz and default_to_baz tests passing!
+//
+// Execute `rustlings hint if2` or use the `hint` watch subcommand for a hint.
+
+// I AM DONE
+
+pub fn foo_if_fizz(fizzish: &str) -> &str {
+    if fizzish == "fizz" {
+        "foo"
+    } else if fizzish == "fuzz" {
+        "bar"
+    } else {
+        "baz"
+    }
+}
+
+// No test changes needed!
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn foo_for_fizz() {
+        assert_eq!(foo_if_fizz("fizz"), "foo")
+    }
+
+    #[test]
+    fn bar_for_fuzz() {
+        assert_eq!(foo_if_fizz("fuzz"), "bar")
+    }
+
+    #[test]
+    fn default_to_baz() {
+        assert_eq!(foo_if_fizz("literally anything"), "baz")
+    }
+}

if/if3.rs

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+// if3.rs
+//
+// Execute `rustlings hint if3` or use the `hint` watch subcommand for a hint.
+
+// I AM DONE
+
+pub fn animal_habitat(animal: &str) -> &'static str {
+    let identifier = if animal == "crab" {
+        1
+    } else if animal == "gopher" {
+        2
+    } else if animal == "snake" {
+        3
+    } else {
+        4
+    };
+
+    // DO NOT CHANGE THIS STATEMENT BELOW
+    let habitat = if identifier == 1 {
+        "Beach"
+    } else if identifier == 2 {
+        "Burrow"
+    } else if identifier == 3 {
+        "Desert"
+    } else {
+        "Unknown"
+    };
+
+    habitat
+}
+
+// No test changes needed.
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn gopher_lives_in_burrow() {
+        assert_eq!(animal_habitat("gopher"), "Burrow")
+    }
+
+    #[test]
+    fn snake_lives_in_desert() {
+        assert_eq!(animal_habitat("snake"), "Desert")
+    }
+
+    #[test]
+    fn crab_lives_on_beach() {
+        assert_eq!(animal_habitat("crab"), "Beach")
+    }
+
+    #[test]
+    fn unknown_animal() {
+        assert_eq!(animal_habitat("dinosaur"), "Unknown")
+    }
+}