finished the rest of the problems to practice

basicMath/MathUtilities.js

@@ -2,19 +2,19 @@ class MathUtilities {
 
 
     add(baseValue, valueToAdd){
-        return -1;
+        return baseValue + valueToAdd;
     }
 
-    subtract(baseValue, valueToAdd){
-        return -1;
+    subtract(baseValue, valueToSubtract){
+        return baseValue - valueToSubtract;
     }
 
-    divide(baseValue, valueToAdd){
-        return -1;
+    divide(baseValue, valueToDivideBy){
+        return baseValue / valueToDivideBy;
     }
 
-    multiply(baseValue, valueToAdd){
-        return -1;
+    multiply(baseValue, valueToMultiplyBy){
+        return baseValue * valueToMultiplyBy;
     }
 }
 

basicMath/MathUtilities.test.js

@@ -74,7 +74,7 @@ test("Test 2 Integer Division", () => {
     let addedValue = 1;
 
     // When
-    let expected = 127;
+    let expected = 2;
     let actual = math.divide(baseValue, addedValue);
     //Then
     expect(actual).toEqual(expected);

strangerStrings/StrangerStrings.js

@@ -1,35 +1,54 @@
 class StrangerStrings {
 
     getHelloWorld(){
-        return null;
+        return "Hello World";
     }
 
     concatenation(firstSegment, secondSegment){
-        return null;
+        return firstSegment + secondSegment;
     }
 
     getPrefix(input){
-        return null;
+        //return input[0] + input[1] + input[2];
+        return input.substring(0, 3);
     }
 
     getSuffix(input){
-        return null;
+        return input[input.length-3] + input[input.length-2] + input[input.length-1];
+        //return input.substring(-3, -1);
     }
 
-    getMiddleCharacter(input){
-        return null;
+    getMiddleCharacter(inputValue){
+        let half = (inputValue.length / 2) - 0.5;
+        return inputValue[half];
     }
 
-    getFirstWord(input){
-        return null;
+    getFirstWord(inputValue){
+        let output = "";
+        for(let i = 0; i < inputValue.length; i++){
+            if(inputValue[i] !== " "){
+                output += inputValue[i];
+            } else{
+                break;
+            }
+        }
+        return output;
     }
 
     getSecondWord(spaceDelimnatedInput){
-        return null;
+        let output = "";
+        for(let i = spaceDelimnatedInput.length -1; i > 0; i--){
+            if(spaceDelimnatedInput[i] !== " "){
+                output += spaceDelimnatedInput[i];
+            } else{
+                break;
+            }
+        }
+        return output.split("").reverse().join("");
     }
 
-    reverse(input){
-        return null;
+    reverse(inputValue){
+        return inputValue.split("").reverse().join("");
     }
 }
 

strangerStrings/StrangerStrings.test.js

@@ -67,7 +67,7 @@ test("return the middle character of `inputValue`", () => {
 
 
     // When
-    let actual = strangerStrings.getMiddleCharacter(input);
+    let actual = strangerStrings.getMiddleCharacter(inputValue);
     //Then
     expect(actual).toEqual(expected);
 });
@@ -89,13 +89,13 @@ test("return the first sequence of characters", () => {
 test("return the second sequence of characters", () => {
     // Given
     let strangerStrings = new StrangerStrings();
-    let inputValue = 'Wutang Clan';
+    let spaceDelimnatedInput = 'Wutang Clan';
 
     let expected = "Clan";
 
 
     // When
-    let actual = strangerStrings.getSecondWord(inputValue);
+    let actual = strangerStrings.getSecondWord(spaceDelimnatedInput);
     //Then
     expect(actual).toEqual(expected);
 });