added example

classes/main.js

@@ -0,0 +1,36 @@
+class CaseUtil{
+    toSnakeCase(s){
+        return s.replaceAll(" ", "_");
+    }
+
+    toKebabCase(s){
+        return s.replaceAll(" ", "-");
+    }
+
+
+    toCamelCase(s){
+        while(s.indexOf(" ") !== -1){
+            const idx = s.indexOf(" ");
+            s = s.replace(" ", "");
+            const capital = s.substring(idx, idx + 1).toUpperCase();
+            s = s.substring(0, idx) + capital + s.substring(idx + 1, s.length);
+        }
+        return s;
+    }
+
+    // bonjour le monde --> bonjouRlEmondE
+    toAlexandreCase(s){
+        const ret = [];
+        for(const word of s.split(" ")){
+            const lastLetterCapitalized = word.substring(word.length - 1, word.length).toUpperCase();
+            const wordWithLastLetterCapitalized = word.substring(0, word.length - 1) + lastLetterCapitalized;
+            ret.push(wordWithLastLetterCapitalized)
+        }
+        return ret.join("");
+    }
+
+}
+
+const caseUtil = new CaseUtil();
+
+alert(caseUtil.toAlexandreCase("bonjour le monde"))