[TypeScript] Sharing Class Behavior with Inheritance in TypeScript
Typescript classes make inheritance much easier to write and understand. In this lesson we look into how to set up inheritance with Typescript classes, extends and super.
class ComicBookCharacter (
constructor{
public alias: string, public health: number , public strength: number,
protected secretIdentity: string
) {}
} class SuperVillain extends ComicBookCharacter {
flaws = ["hubris", "always explains evil plan"]; constructor(a, b, c, d) {
console.log('${this.alias} eats kittens!!!');
super(a, b, c, d);
}
}
To review, we can set up inheritance with the extends
keyword. The protected
access modifier can't be accessed outside of a class just like the private
access modifier, but it can be accessed in derived classes.
If you don't define a constructor, the derived class will use the base class's constructor. If you do define the constructor in a derived class, super must be called before anything else can happen.
[TypeScript] Sharing Class Behavior with Inheritance in TypeScript的更多相关文章
- [TypeScript] Distinguishing between types of Strings in TypeScript
In JavaScript, many libraries use string arguments to change behavior. In this lesson we learn how T ...
- [TypeScript] Define Custom Type Guard Functions in TypeScript
One aspect of control flow based type analysis is that the TypeScript compiler narrows the type of a ...
- [TypeScript] Union Types and Type Aliases in TypeScript
Sometimes we want our function arguments to be able to accept more than 1 type; e.g. a string or an ...
- [TypeScript] Using Assertion to Convert Types in TypeScript
Sometimes the compiler needs help figuring out a type. In this lesson we learn how to help out the c ...
- [TypeScript] Using Interfaces to Describe Types in TypeScript
It’s easy to pass the wrong value to a function. Typescript interfaces are great because they catch ...
- [TypeScript] Catch unsafe use of "this" in TypeScript functions
this is probably the most tricky thing to use in JavaScript and therefore TypeScript. Fortunately th ...
- [TypeScript ] Using the Null Coalescing operator with TypeScript 3.7
The postshows you how to use the null coalescing operator (??) instead of logical or (||) to set def ...
- 我要涨知识 —— TypeScript 常见面试题(一)
1.ts 中的 any 和 unknown 有什么区别? unknown 和 any 的主要区别是 unknown 类型会更加严格:在对 unknown 类型的值执行大多数操作之前,我们必须进行某种形 ...
- 转职成为TypeScript程序员的参考手册
写在前面 作者并没有任何可以作为背书的履历来证明自己写作这份手册的分量. 其内容大都来自于TypeScript官方资料或者搜索引擎获得,期间掺杂少量作者的私见,并会标明. 大部分内容来自于http:/ ...
随机推荐
- js---对象 和 函数this
一:对象创建的方法 //普通 字面量形式 var obj = { name:'名字', fn:function(){ console.log(this.name); } } //new 实例 var ...
- dfs算法中求数列的组合
/* 从13个书中挑选5个值,他们的组合可能是 什么, 如下代码 dfs深度遍历, 和全排列是一种方法,但是思路不同 */ public class Main { static int count = ...
- 如何在canvas中画出一个太极图
先放一个效果图: 代码如下 <!DOCTYPE html> <html> <head> <meta charset="utf-8" /&g ...
- angularjs之ui-bootstrap的Datepicker Popup不使用JS实现双日期选择控件
最开始使用ui-bootstrap的Datepicker Popup日期选择插件实现双日期选择时间范围时,在网上搜了一些通过JS去实现的方法,不过后来发现可以不必通过JS去处理,只需要使用其自身的属性 ...
- VC多线程临界区
在使用多线程时,一般非常少有多个线程全然独立的工作.往往是多个线程同一时候操作一个全局变量来获取程序的执行结果.多个线程同一时候訪问同一个全局变量,假设都是读取操作,则不会出现故障. 假设是写操作,则 ...
- [C++11] 默认构造函数
类通过一个特殊的构造函数来控制默认初始化过程.这个函数就是默认构造函数.默认构造函数无需不论什么实參. 我们能够显示的定义默认构造函数也能够让编译器为我们生成默认构造函数. 默认构造函数以例如以下规则 ...
- [Angular] Create a custom validator for template driven forms in Angular
User input validation is a core part of creating proper HTML forms. Form validators not only help yo ...
- Codeforces Round #316 (Div. 2) A B C
A. Elections time limit per test 1 second memory limit per test 256 megabytes input standard input o ...
- android-LinearLayout 控件占满父容器位置实现
经常碰到需要把一个控件放在手机底部的情况,以前都是在LinearLayout尝试使用gravity="bottom" ,但是,没有效果,后来在网上查到了方法,如下 <Line ...
- affix附加导航插件
<style> a:focus { outline: none; } .nav-pills { width: 150px; } .nav-pills.affix { top : 10px; ...