Solved: 10 - Function Basics

modules/03_functions/src/function_basics.cpp

@@ -1,10 +1,26 @@
 #include "function_basics.hpp"
 
+#include <ranges>
+
 namespace functions {
 
-auto square(int value) -> int { (void)value; return 0; }
-void swap_integers(int& lhs, int& rhs) { (void)lhs; (void)rhs; }
-auto concatenate(const std::vector<std::string>& parts) -> std::string { (void)parts; return {}; }
-void append_suffix(std::string& text, const std::string& suffix) { (void)text; (void)suffix; }
+auto square(const int value) -> int {
+    return value * value;
+}
+
+void swap_integers(int& lhs, int& rhs) {
+    const int tmp = lhs;
+    lhs = rhs;
+    rhs = tmp;
+}
+
+auto concatenate(const std::vector<std::string>& parts) -> std::string {
+    return std::ranges::to<std::string>(std::views::join(parts));
+}
+
+void append_suffix(std::string& text, const std::string& suffix) {
+    // The string is passed by reference, so it can have text appended
+    text += suffix;
+}
 
 }  // namespace functions