classes and interfaces

Author: ivankatliarchuk

2-understand/s5-class-interfaces/app.js

@@ -0,0 +1,23 @@
+"use strict";
+let add;
+add = (n1, n2) => {
+    return n1 + n2;
+};
+let iAdd;
+iAdd = (n1, n2) => {
+    return n1 + n2;
+};
+class Person {
+    constructor(name) {
+        if (name) {
+            this.name = name;
+        }
+        else {
+            console.log('Hi!');
+        }
+    }
+    greet(phrase) {
+        console.log(phrase);
+    }
+}
+console.log(new Person('Mikes'));

2-understand/s5-class-interfaces/app.ts

@@ -1,50 +1,42 @@
-class Department {
-  private employees: string[] = [];
-
-  constructor(private readonly id: string, public name: string) {
-    this.id = id;
-    this.name = name;
-  }
-
-  describe(this: Department) {
-    console.log('Department: ' + this.name);
-  }
+type AddFn = (a: number, b: number) => number;
+let add: AddFn;
+add = (n1: number, n2: number) => {
+  return n1 + n2;
+}
 
-  addEmployee(employee: string) {
-    this.employees.push(employee);
-  }
+interface IAddFn {
+  (a: number, b: number): number;
+}
 
-  printEmployeeInfo() {
-    console.log(this.employees.length);
-    console.log(this.employees)
-  }
+let iAdd: IAddFn;
+iAdd = (n1: number, n2: number) => {
+  return n1 + n2;
 }
 
-class ITDepartment extends Department {
-  constructor(id: string, public admins: string[]) {
-    super(id, 'IT');
-    this.admins = admins;
-  }
+interface Named {
+  readonly name?: string;
+  outputName?: string;
 }
 
-const dep = new ITDepartment('it1', ['John', 'Celvin']);
-console.log(dep)
+interface Greetable extends Named {
+  greet(phrase: string): void;
+}
 
-class Accounting extends Department {
-  constructor(id: string, private reports: string[]) {
-    super(id, 'Accounting');
-    this.reports = reports;
-  }
+interface Another {}
 
-  addReport(text: string) {
-    this.reports.push(text);
+class Person implements Greetable, Another {
+  name?: string;
+  constructor(name?: string) {
+    if (name) {
+      this.name = name;
+    } else {
+      console.log('Hi!')
+    }
   }
 
-  getReports() {
-    console.log(this.reports)
+  greet(phrase: string): void {
+    console.log(phrase)
   }
 }
 
-const acc = new Accounting('it1', []);
-acc.addReport('Something went wrong')
-console.log(acc)
+console.log(new Person('Mikes'))

2-understand/s5-class-interfaces/interface-ext.ts

@@ -0,0 +1,42 @@
+type AddFn = (a: number, b: number) => number;
+let add: AddFn;
+add = (n1: number, n2: number) => {
+  return n1 + n2;
+}
+
+interface IAddFn {
+  (a: number, b: number): number;
+}
+
+let iAdd: IAddFn;
+iAdd = (n1: number, n2: number) => {
+  return n1 + n2;
+}
+
+interface Named {
+  readonly name?: string;
+  outputName?: string;
+}
+
+interface Greetable extends Named {
+  greet(phrase: string): void;
+}
+
+interface Another { }
+
+class Person implements Greetable, Another {
+  name?: string;
+  constructor(name?: string) {
+    if (name) {
+      this.name = name;
+    } else {
+      console.log('Hi!')
+    }
+  }
+
+  greet(phrase: string): void {
+    console.log(phrase)
+  }
+}
+
+console.log(new Person('Mikes'))

2-understand/s5-class-interfaces/interface.ts

@@ -0,0 +1,18 @@
+interface Person {
+  name: string;
+  age: number;
+
+  greet(phrase: string): void;
+}
+let user1: Person;
+
+user1 = {
+  name: 'john',
+  age: 23,
+  greet(phrase: string) {
+    console.log(phrase + ' ' + this.name)
+  }
+}
+console.log(user1)
+
+user1.greet('Hi there - I am ')