diff --git a/StringsAndTings.js b/StringsAndTings.js
index 4fdca47..6c77acb 100644
--- a/StringsAndTings.js
+++ b/StringsAndTings.js
@@ -2,28 +2,69 @@ class StringsAndTings {
     
     // @return string with identical content, and the first character capitalized
     camelCase(str){
-        return null;
+        // Split string into an array
+        let stringSplit = str.split(" ");
+
+        // char at to select the first letter and also to uppercase to capitalize of each indice in the array
+        for (let i = 0; i < stringSplit.length; i++) {
+            let word = stringSplit[i];
+            stringSplit[i] = word[0].toUpperCase() + word.substring(1);
+        }    
+        return stringSplit.join(" ");
     }
 
     //@return string with identical contents, with each word individually in reverse order
     reverseString(str){
-        return null;
+        let reverse = "";
+        for (let i = str.length - 1; i >= 0; i--) {
+        reverse += str[i];
+    }
+    return reverse;
     }
+    
+    // @return string with each word reversed but still in the same order
+    reverseWords(str){
+        let stringSplit = str.split(" ");
+        let newArr = [];
 
-    // @return string with identical contents, in reverse order, with first character capitalized
-    reverseThenCamelCase(str){
-        return null;
+        for (let i = 0; i < stringSplit.length; i++){
+            stringSplit[i] = stringSplit[i].split("").reverse();
+            let rejoin = stringSplit[i].join("") + " ";
+            newArr += rejoin;
+        }
+        return newArr.trim()
+    }
+    
+   // @return string with identical contents, in reverse order, with first character capitalized
+   reverseThenCamelCase(str){
+    let reverseCap = str.split("").reverse().join("");
+    let string = reverseCap.split(" ");
+    for (let i = 0; i < string.length; i++) {
+        let word = string[i];
+        string[i] = word[0].toUpperCase() + word.substring(1);
+    }
+    return string.join(" ");
     }
 
     // @return string with identical contents excluding first and last character
     removeFirstAndLastCharacter(str){
-        return null;
+        let firstLastChar = str.substring(1, str.length - 1);
+        return firstLastChar;
     }
 
     // @return string with identical characters, each with opposite casing
     invertCasing(str){
-        return null;
+        var output = "";
+        for(var i = 0; i < str.length; i++){
+            if(str[i] == str[i].toUpperCase()){
+                output += str[i].toLowerCase();
+            }else{
+                output += str[i].toUpperCase();
+            }
+        }
+        return output;
     }
 }
 
+
 module.exports = StringsAndTings;
\ No newline at end of file
diff --git a/StringsAndTings.test.js b/StringsAndTings.test.js
index 689b63d..98942ab 100644
--- a/StringsAndTings.test.js
+++ b/StringsAndTings.test.js
@@ -8,7 +8,7 @@ test("camelCaseTest", () => {
     let input = "she sells sea shells";
     let expected = "She Sells Sea Shells";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.camelCase("she sells sea shells");
 
     expect(actual).toEqual(expected);
 });
@@ -19,7 +19,7 @@ test("reverseTest", () => {
     let input = "she sells sea shells";
     let expected = "sllehs aes slles ehs";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.reverseString("she sells sea shells");
 
     expect(actual).toEqual(expected);
 });
@@ -30,7 +30,7 @@ test("reverseWordsTest", () => {
     let input = "she sells sea shells";
     let expected = "ehs slles aes sllehs";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.reverseWords("she sells sea shells");
 
     expect(actual).toEqual(expected);
 });
@@ -41,7 +41,7 @@ test("reverseThenCamelCaseTest", () => {
     let input = "she sells sea shells";
     let expected = "Sllehs Aes Slles Ehs";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.reverseThenCamelCase("she sells sea shells");
 
     expect(actual).toEqual(expected);
 });
@@ -52,7 +52,7 @@ test("removeFirstAndLastCharacterTest", () => {
     let input = "she sells sea shells";
     let expected = "he sells sea shell";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.removeFirstAndLastCharacter("she sells sea shells");
 
     expect(actual).toEqual(expected);
 });
@@ -64,7 +64,7 @@ test("invertCasingTest1", () => {
     let input = "shE sells SEA sHeLlS";
     let expected = "SHe SELLS sea ShElLs";
 
-    let actual = stringsAndTings.camelCase(15);
+    let actual = stringsAndTings.invertCasing("shE sells SEA sHeLlS");
 
     expect(actual).toEqual(expected);
 });