completed lab

StringsAndTings.js

@@ -2,27 +2,62 @@ class StringsAndTings {
 
     // @return string with identical content, and the first character capitalized
     camelCase(str){
-        return null;
+        let output = str.split(" ");
+        for(let i = 0; i < output.length; i++){
+            let word = output[i];
+            output[i] = word[0].toUpperCase() + word.substring(1);
+        }
+
+        return output.join(" ");
     }
 
     //@return string with identical contents, with each word individually in reverse order
     reverseString(str){
-        return null;
+        let copy = str;
+        let splitStr = copy.split("");
+        let reverseStr = splitStr.reverse();
+        let joinStr = reverseStr.join("");
+        return joinStr;
+    }
+
+    reverseWords(str){
+        let copy = str;
+        let output = "";
+        let words = copy.split(" ");
+        for(let i = 0; i < words.length; i++){
+            let reverse = this.reverseString(words[i]);
+            output += ` ${reverse}`;
+        }
+        return output.trim();
     }
 
     // @return string with identical contents, in reverse order, with first character capitalized
     reverseThenCamelCase(str){
-        return null;
+        let reverse = this.reverseString(str);
+        let reverseCamel = this.camelCase(reverse);
+        return reverseCamel;
     }
 
     // @return string with identical contents excluding first and last character
     removeFirstAndLastCharacter(str){
-        return null;
+        let copy = str;
+        let remove = copy.substr(1, copy.length - 2);
+        return remove;
     }
 
     // @return string with identical characters, each with opposite casing
     invertCasing(str){
-        return null;
+        let copy = str;
+        let output = "";
+        for(let i = 0; i < copy.length; i++){
+            let character = copy[i];
+            if(character == character.toLowerCase()){
+                output += character.toUpperCase();
+            } else if(character == character.toUpperCase()){
+                output += character.toLowerCase();
+            }
+        }
+        return output;
     }
 }
 

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(input);
 
     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(input);
 
     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(input);
 
     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(input);
 
     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(input);
 
     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(input);
 
     expect(actual).toEqual(expected);
 });