Exercices CM 1

exercice1.js

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+function addition(a, b) {
+  return a + b;
+}
+
+console.log(addition(2, 3));      // attendu : 5
+console.log(addition("2", 3));    // attendu : ?
+console.log(addition(true, 3));   // attendu : ?

exercice1.ts

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+function addition(a, b) {
+  return a + b;
+}
+
+console.log(addition(2, 3));      // attendu : 5
+console.log(addition("2", 3));    // attendu : ?
+console.log(addition(true, 3));   // attendu : ?
+
+namespace Typed {
+  function addition(a: number, b: number): number {
+    return a + b;
+  }
+
+  console.log(addition(2, 3));
+  // L'argument de type 'string' n'est pas attribuable au paramètre de type 'number'.ts(2345)
+  console.log(addition("2", 3));
+  // L'argument de type 'boolean' n'est pas attribuable au paramètre de type 'number'.ts(2345)
+  console.log(addition(true, 3));
+}

exercice2.js

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+function afficherUtilisateur(user) {
+    console.log(`${user.nom} a ${user.age} ans`);
+}
+
+afficherUtilisateur({ nom: "Alice", age: 25 });
+afficherUtilisateur({ nom: "Bob" }); // manque age

exercice2.ts

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+interface Utilisateur {
+    nom: string;
+    age: number;
+}
+
+function afficherUtilisateur(u: Utilisateur): void {
+    console.log(`${u.nom} a ${u.age} ans`);
+}
+
+afficherUtilisateur({ nom: "Alice", age: 25 });
+// L'argument de type '{ nom: string; }' n'est pas attribuable
+// au paramètre de type 'Utilisateur'.
+//  La propriété 'age' est absente du type '{ nom: string; }'
+//  mais obligatoire dans le type 'Utilisateur'.ts(2345)
+afficherUtilisateur({ nom: "Bob" });

exercice3.ts

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+interface Animal {
+  name: string;
+}
+interface Dog extends Animal {
+  bark: () => void;
+}
+interface Cat extends Animal {
+  meow: () => void;
+}
+const makeNoise = (animal: Animal) => {
+  if (animal instanceof Dog) {
+    // 'Dog' fait uniquement référence à un type mais s'utilise en tant que valeur ici.ts(2693)
+    animal.bark();
+  }
+};
+
+namespace TaggedUnion {
+  interface Dog {
+    kind: "dog"; // Tagged union
+    bark: () => void;
+  }
+  interface Cat {
+    kind: "cat"; // Tagged union
+    meow: () => void;
+  }
+  type Animal = Dog | Cat;
+  const makeNoise = (animal: Animal) => {
+    if (animal.kind === "dog") animal.bark();
+    else animal.meow();
+  };
+  const dog: Dog = {
+    kind: "dog",
+    bark: () => console.log("bark"),
+  };
+  makeNoise(dog);
+}
+
+namespace Classes {
+  class Dog {
+    constructor(public name: string, public bark: () => void) {}
+  }
+  class Cat {
+    constructor(public name: string, public meow: () => void) {}
+  }
+  type Animal = Dog | Cat;
+  const makeNoise = (animal: Animal) => {
+    if (animal instanceof Dog) animal.bark();
+    else animal.meow();
+  };
+  const dog = new Dog("Fido", () => console.log("bark"));
+  makeNoise(dog);
+}

exercice4.js

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+function readFile(path, charset) {
+  throw new Error("Function not implemented.");
+}
+
+function readTextFileIfExists(path) {
+  return new Promise((resolve, reject) => {
+    if (!path) {
+      reject(new Error("No file path provided"));
+      return;
+    }
+
+    readFile(path, "utf8")
+      .then(data => {
+        if (data.length === 0) {
+          reject(new Error("File is empty")); // explicit failure
+        } else {
+          resolve(data); // successful read
+        }
+      })
+      .catch(err => reject(err)); // I/O error
+  });
+}
+
+readTextFileIfExists("data.txt")
+  .then(text => console.log("File contents:", text))
+  .catch(err => console.error("I/O error:", err.message));
+
+try {
+  const text = await readTextFileIfExists("data.txt");
+  console.log("File contents:", text);
+} catch (err) {
+  console.error("I/O error:", err.message);
+}
+
+const files = ["file1.txt", "file2.txt", "file3.txt"];
+
+for (const file of files) {
+  try {
+    const text = await readTextFileIfExists(file);
+    console.log("File contents:", text);
+  } catch (err) {
+    console.error("I/O error:", err.message);
+    continue;
+  }
+}
+
+const otherFiles = ["does_not_exist.txt", "file2.txt", "file3.txt"];
+
+const failContents = await Promise.all(
+  otherFiles.map(readTextFileIfExists)
+);
+try {
+    failContents.forEach((text, i) => {
+      console.log("File contents:", text);
+    });
+} catch (err) {
+    console.error("I/O error:", err.message);
+}
+
+const successContents = await Promise.allSettled(
+  files.map(readTextFileIfExists)
+);
+successContents.forEach((result, i) => {
+  if (result.status === "fulfilled") {
+      console.log("File contents:", result.value);
+  } else if (result.status === "rejected") {
+      console.error("I/O error:", result.reason);
+  }
+});

exercice5.ts

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+const listener = Deno.listen({ port: 8080 });
+
+const decoder = new TextDecoder();
+const encoder = new TextEncoder();
+
+for await (const conn of listener) {
+  handleConn(conn);
+}
+
+async function handleConn(conn: Deno.Conn) {
+  const buf = new Uint8Array(1024);
+  const bytes = await conn.read(buf);
+  if (bytes === null) {
+    conn.close();
+    return;
+  }
+
+  const rawRequest = decoder.decode(buf.subarray(0, bytes));
+
+  console.log(rawRequest);
+
+  const [
+    requestMethod,
+    requestHost,
+    requestUserAgent,
+    requestAccept,
+    requestContentType,
+    requestContentLength,
+    _,
+    requestBody,
+  ] = rawRequest.split("\r\n");
+
+  const [method, path, protocol] = requestMethod.split(" ");
+  const [, host] = requestHost.split(" ");
+  const [, userAgent] = requestUserAgent.split(" ");
+  const [, accept] = requestAccept.split(" ");
+  const [, contentType] = requestContentType.split(" ");
+  const [, contentLength] = requestContentLength.split(" ");
+
+  const responseBody = `{` +
+    `"method": "${method}",` +
+    `"path": "${path}",` +
+    `"protocol": "${protocol}",` +
+    `"host": "${host}",` +
+    `"user-agent": "${userAgent}",` +
+    `"accept": "${accept}",` +
+    `"content-type": "${contentType}",` +
+    `"content-length": "${contentLength}",` +
+    `"body": "${requestBody}"` +
+    `}\n`;
+
+  const response =
+    "HTTP/1.1 200 OK\r\n" +
+    "Content-Type: text/json\r\n" +
+    `Content-Length: ${responseBody.length}\r\n` +
+    "Connection: close\r\n" +
+    "\r\n" +
+    responseBody;
+
+  await conn.write(encoder.encode(response));
+  conn.close();
+}