02_advanced/uebungen/u20_geoquiz-2/index.html

@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="de">
   <head>
     <meta charset="UTF-8" />
@@ -35,7 +35,29 @@
         ['Russia', 'Moscow'],
       ];
 
-      const getCountryForCapital = () => {};
+      const getCountryForCapital = (capital) => {
+        for (const [country, countryCapital] of countriesWithCapital) {
+          if (countryCapital === capital) {
+            return country;
+          }
+        }
+
+        return undefined;
+      };
+
+      const getCountryForCapital2 = (capital) => {
+        const foundCountryAr = countriesWithCapital.find(
+          (arr) => arr[1].trim().toLowerCase() === capital.trim().toLowerCase(),
+        );
+
+        return foundCountryAr ? foundCountryAr[0] : undefined;
+      };
+
+      console.log('London:', getCountryForCapital2('London')); // => London: UK
+      console.log('London:', getCountryForCapital2('london')); // => London: UK
+      console.log('London:', getCountryForCapital2('')); // => London: undefined
+      console.log('Paris:', getCountryForCapital2('Paris')); // => Paris: France
+      console.log('Vienna:', getCountryForCapital2('Vienna')); // => Vienna: Austria
     </script>
   </body>
 </html>