Programming-Contents-List · 4BFC · Aug 26, 2024 · Aug 26, 2024 · Aug 29, 2024 · Aug 29, 2024
diff --git a/dist/app.js b/dist/app.js
@@ -1,31 +1,16 @@
 "use strict";
-var Department = /** @class */ (function () {
-    // readonly는 프로퍼티를 초기화한 후 수정할 수 없다. 즉, 한번 할당 되면 변경되면 안되는 고유 번호들을 설정할 때 readonly를 사용한다.
-    function Department(id, name) {
-        this.id = id;
-        this.name = name;
-        // private id: string;
-        // private name: string;
-        this.employees = [];
-        // this.id = id;
-        // this.name = n
+// function merge<T extends object, U extends object>(objA: T, objB: U): T & U {
+//   return Object.assign({}, objA, objB);
+// }
+function countAndDescribe(element) {
+    let descriptionText = "Got no Value";
+    if (element.length === 1) {
+        descriptionText = "Got 1 element";
     }
-    Department.prototype.describe = function () {
-        console.log("Department (".concat(this.id, "): ").concat(this.name));
-    };
-    Department.prototype.addEmployee = function (employee) {
-        // this.id = '2';  // readonly이기 때문에 error가 발생한다.
-        this.employees.push(employee);
-    };
-    Department.prototype.printEmployeeInformation = function () {
-        console.log(this.employees.length);
-        console.log(this.employees);
-    };
-    return Department;
-}());
-var accounting = new Department('1', 'Accounting');
-accounting.addEmployee('Max');
-accounting.addEmployee('Manu');
-// accounting.employees[2] = 'Anna';
-accounting.describe();
-accounting.printEmployeeInformation();
+    else if (element.length > 1) {
+        descriptionText = 'Got ' + element.length + ' elements.';
+    }
+    return [element, descriptionText];
+    // return ['Max', 'Tom']; //error 발생 : 타입을 명시했기 때문에 그렇다.
+}
+console.log(countAndDescribe('Hi, there!'));
diff --git a/index.html b/index.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Document</title>
+</head>
+
+<body>
+  <script src="./dist/app.js"></script>
+</body>
+
+</html>
diff --git a/src/app.ts b/src/app.ts
@@ -1,83 +1,27 @@
-class Department {
-  // private id: string;
-  // private name: string;
-  private employees: string[] = [];
-  // readonly는 프로퍼티를 초기화한 후 수정할 수 없다. 즉, 한번 할당 되면 변경되면 안되는 고유 번호들을 설정할 때 readonly를 사용한다.
-  constructor(private readonly id: string, public name: string) {
-    // this.id = id;
-    // this.name = n
-  }
-  describe(this: Department) {
-    console.log(`Department (${this.id}): ${this.name}`);
-  }
+// function merge<T extends object, U extends object>(objA: T, objB: U): T & U {
+//   return Object.assign({}, objA, objB);
+// }
 
-  addEmployee(employee: string) {
-    // this.id = '2';  // readonly이기 때문에 error가 발생한다.
-    this.employees.push(employee);
-  }
+// const mergeObj = merge({ name: 'Max', hobbies: ['Sports'] }, { age: 30 });
 
-  printEmployeeInformation() {
-    console.log(this.employees.length);
-    console.log(this.employees);
-  }
-}
+// const mergeObj2 = merge({ name: 'Max' }, { age: 30 });
 
-class ITDepartment extends Department {
-  admins: string[];
-  constructor(id: string, admins: string[]) {
-    super(id, 'IT');
-    this.admins = admins;
-  }
-}
-
-class AccountingDepartment extends Department {
-  private lastReport: string;
+// console.log(mergeObj.name);
 
-  get mostRecentReport() {
-    if (this.lastReport) {
-      return this.lastReport;
-    }
-    throw new Error('No report found.');
-  }
-
-  set setMostRecentReport(value: string) {
-    if (!value) {
-      throw new Error('Please pass in a valid value!')
-    }
-    this.addReport(value);
-    this.lastReport = value;  // 여기서 lastReport를 업데이트 그래야 lastReport가 비어있지 않기 때문에 정상적으로 동작을 한다.
-  }
-
-  constructor(id: string, private reports: string[]) {
-    super(id, 'Account');
-    //strictPropertyInitialization 활성화로 초기화 해줘야 함.
-    this.lastReport = reports[0] || ""; // 초기값을 할당 (reports가 비어있으면 빈 문자열)
-  }
-
-  addReport(text: string) {
-    this.reports.push(text);
-  }
+//interface와 Generics의 조합
+interface Length {
+  length: number;
+}
 
-  printReports() {
-    console.log(this.reports);
+function countAndDescribe<T extends Length>(element: T): [T, string] {  //반환값은 Generics를 사용했기에 타입추론이되지만 명확하게 명시를 해줘야한다면 현재와같이 작성하면 된다.
+  let descriptionText = "Got no Value";
+  if (element.length === 1) {
+    descriptionText = "Got 1 element";
+  } else if (element.length > 1) {
+    descriptionText = 'Got ' + element.length + ' elements.';
   }
+  return [element, descriptionText];
+  // return ['Max', 'Tom']; //error 발생 : 타입을 명시했기 때문에 그렇다.
 }
-const accounting = new Department('1', 'Accounting');
-const ITaccounting = new ITDepartment('2', ['Max']);
-
-ITaccounting.addEmployee('Max');
-ITaccounting.addEmployee('Manu');
-
-// accounting.employees[2] = 'Anna';
-ITaccounting.describe();
-ITaccounting.printEmployeeInformation();
-
-const NewAccounting = new AccountingDepartment('d2', []);
-
-// console.log(NewAccounting.mostRecentReport);  //report가 추가되지 않아서 Error
-NewAccounting.setMostRecentReport = 'Year End Report';
-NewAccounting.addReport('Something went wrong...');
-
-console.log(NewAccounting.mostRecentReport);  //report가 있어서 문제없이 출력
 
-NewAccounting.printReports();
+console.log(countAndDescribe('Hi, there!'));