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Author: surface74

code/module-02/m02-start/module02.ts

@@ -2,82 +2,101 @@
    Lab start  */
 
 /*  EXERCISE 1
-    TODO: Modify the code to add types to the variable declarations. 
+    TODO: Modify the code to add types to the variable declarations.
     The resulting JavaScript should look the same as the original example when you're done. */
 
-let firstName;
-let lastName;
-let fullName;
-let age;
-let ukCitizen;
+let firstName: string;
+let lastName: string;
+let fullName: string;
+let age: number;
+let ukCitizen: boolean;
 
-firstName = 'Rebecca';
-lastName = 'Smith';
+firstName = "Rebecca";
+lastName = "Smith";
 age = 42;
 ukCitizen = false;
-fullName = firstname + " " + lastname;
+fullName = firstName + " " + lastName;
 
 if (ukCitizen) {
-    console.log("My name is " + fullName + ", I'm " + age + ", and I'm a citizen of the United Kingdom.");
+  console.log(
+    "My name is " +
+      fullName +
+      ", I'm " +
+      age +
+      ", and I'm a citizen of the United Kingdom."
+  );
 } else {
-    console.log("My name is " + fullName + ", I'm " + age + ", and I'm not a citizen of the United Kingdom.");
+  console.log(
+    "My name is " +
+      fullName +
+      ", I'm " +
+      age +
+      ", and I'm not a citizen of the United Kingdom."
+  );
 }
 
 /* EXERCISE 2
-   TODO: You can use types to ensure operation outcomes. Run the code as is and then modify 
-   it to have strongly typed variables. Then, address any errors you find so that the result 
+   TODO: You can use types to ensure operation outcomes. Run the code as is and then modify
+   it to have strongly typed variables. Then, address any errors you find so that the result
    returned to a is 12. */
 
-let x;
-let y;
-let a;
+enum num {
+  five = 5,
+}
+let x: num;
+let y: number;
+let a: number;
 
-x = 'five';
+x = num.five;
 y = 7;
 a = x + y;
 
 console.log(a);
 
 /* EXERCISE 3
-   TODO: In the following code, implement an enum type called Season that represents 
-   the constants "Fall", "Winter", "Spring", and "Summer". Then, update the function so 
-   you can pass in the season by referencing an item in the enum, for example 
+   TODO: In the following code, implement an enum type called Season that represents
+   the constants "Fall", "Winter", "Spring", and "Summer". Then, update the function so
+   you can pass in the season by referencing an item in the enum, for example
    Season.Fall, instead of the literal string "Fall". */
 
-function whichMonths(season) {
-
-    let monthsInSeason: string;
-
-    switch (season) {
-        case "Fall":
-            monthsInSeason = "September to November";
-            break;
-        case "Winter":
-            monthsInSeason = "December to February";
-            break;
-        case "Spring":
-            monthsInSeason = "March to May";
-            break;
-        case "Summer":
-            monthsInSeason = "June to August";
-    }
-
-    return monthsInSeason;
+enum Season {
+  "Fall",
+  "Winter",
+  "Spring",
+  "Summer",
+}
+
+function whichMonths(season: Season) {
+  let monthsInSeason: string;
+
+  switch (season) {
+    case Season.Fall:
+      monthsInSeason = "September to November";
+      break;
+    case Season.Winter:
+      monthsInSeason = "December to February";
+      break;
+    case Season.Spring:
+      monthsInSeason = "March to May";
+      break;
+    case Season.Summer:
+      monthsInSeason = "June to August";
+  }
+
+  return monthsInSeason;
 }
 
-console.log(whichMonths("Fall"));
+console.log(whichMonths(Season.Fall));
 
 /* EXERCISE 4
    TODO: Declare the array as the type to match the type of the items in the array. */
 
-   let randomNumbers;
-   let nextNumber;
-   
-   for (let i = 0; i < 10; i++) {
-       nextNumber = Math.floor(Math.random() * (100 - 1)) + 1;
-       randomNumbers.push(nextNumber);
-   }
-   
-   console.log(randomNumbers);
-
-   
+let randomNumbers: number[] = [];
+let nextNumber: number;
+
+for (let i = 0; i < 10; i++) {
+  nextNumber = Math.floor(Math.random() * (100 - 1)) + 1;
+  randomNumbers.push(nextNumber);
+}
+
+console.log(randomNumbers);