9.4 - 9.5

Author: dhatGuy

part9/bmiCalculator.ts

@@ -1,23 +1,23 @@
-interface BmiValues {
-  value1: number;
-  value2: number;
-}
+// interface BmiValues {
+//   value1: number;
+//   value2: number;
+// }
 
-const parseArguments = (args: Array<string>): BmiValues => {
-  if (args.length < 4) throw new Error("Not enough arguments");
-  if (args.length > 4) throw new Error("Too many arguments");
+// const parseArguments = (args: Array<string>): BmiValues => {
+//   if (args.length < 4) throw new Error("Not enough arguments");
+//   if (args.length > 4) throw new Error("Too many arguments");
 
-  if (!isNaN(Number(args[2])) && !isNaN(Number(args[3]))) {
-    return {
-      value1: Number(args[2]),
-      value2: Number(args[3]),
-    };
-  } else {
-    throw new Error("Provided values were not numbers!");
-  }
-};
+//   if (!isNaN(Number(args[2])) && !isNaN(Number(args[3]))) {
+//     return {
+//       value1: Number(args[2]),
+//       value2: Number(args[3]),
+//     };
+//   } else {
+//     throw new Error("Provided values were not numbers!");
+//   }
+// };
 
-const calculateBMI = (height: number, weight: number): string => {
+export const calculateBMI = (height: number, weight: number): string => {
   const bmiValue = (weight / height / height) * 10000;
   switch (true) {
     case bmiValue < 16.0:
@@ -39,16 +39,16 @@ const calculateBMI = (height: number, weight: number): string => {
   }
 };
 
-const a: number = Number(process.argv[2]);
-const b: number = Number(process.argv[3]);
+// const a: number = Number(process.argv[2]);
+// const b: number = Number(process.argv[3]);
 
-try {
-  const { value1, value2 } = parseArguments(process.argv);
-  console.log(calculateBMI(value1, value2));
-} catch (error: unknown) {
-  let errorMessage = "Something bad happened.";
-  if (error instanceof Error) {
-    errorMessage += " Error: " + error.message;
-  }
-  console.log(errorMessage);
-}
+// try {
+//   const { value1, value2 } = parseArguments(process.argv);
+//   console.log(calculateBMI(value1, value2));
+// } catch (error: unknown) {
+//   let errorMessage = "Something bad happened.";
+//   if (error instanceof Error) {
+//     errorMessage += " Error: " + error.message;
+//   }
+//   console.log(errorMessage);
+// }

part9/index.ts

@@ -0,0 +1,32 @@
+import express from "express";
+import { calculateBMI } from "./bmiCalculator";
+
+const app = express();
+
+app.get("/hello", (_req, res) => {
+  res.send("Hello Full Stack!");
+});
+
+app.get("/bmi", (req, res) => {
+  const { height, weight } = req.query;
+  if (!height || !weight) {
+    res.status(400).send({ error: "malformatted parameters" });
+  }
+  const heightNum = Number(height);
+  const weightNum = Number(weight);
+
+  if (isNaN(heightNum) || isNaN(weightNum)) {
+    res.status(400).send({ error: "malformatted parameters" });
+  }
+
+  const bmi = calculateBMI(heightNum, weightNum);
+  res.send({
+    weight: weightNum,
+    height: heightNum,
+    bmi,
+  });
+});
+
+app.listen(3333, () => {
+  console.log("🚀 Server started on port 3333!");
+});

part9/package.json

@@ -5,12 +5,19 @@
   "license": "MIT",
   "scripts": {
     "calculateBMI": "ts-node bmiCalculator.ts",
-    "calculateExercises": "ts-node exerciseCalculator.ts"
+    "calculateExercises": "ts-node exerciseCalculator.ts",
+    "start": "ts-node index.ts",
+    "dev": "ts-node-dev index.ts"
   },
   "devDependencies": {
+    "@types/express": "^4.17.13",
     "@types/node": "^17.0.10",
     "ts-node": "^10.4.0",
+    "ts-node-dev": "^1.1.8",
     "tslib": "^2.3.1",
     "typescript": "^4.5.4"
+  },
+  "dependencies": {
+    "express": "^4.17.2"
   }
 }

part9/tsconfig.json

@@ -1,5 +1,15 @@
 {
   "compilerOptions": {
-    "noImplicitAny": true
+    "noImplicitAny": true,
+    "noImplicitReturns": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "strictBindCallApply": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitThis": true,
+    "alwaysStrict": true,
+    "esModuleInterop": true,
+    "declaration": true
   }
 }