Wen-Chun Lin cataska

Lessons in Using Continuations

This gist contains examples of how to build different kinds of control flow structures in Racket using macros and continuations. Examples include:

Early exit from functions using a return statement.
Early exit from arbitrary expressions using a simple exception system.
Temporarily interrupting execution in order to check permissions.

Model 層級管理

Domain Model 層的意義

一個傳統 Java Spring 的應用程式會分為三層 @Controller @Service @Repository，然後依據組織需求，再往下細分。比方說 Service 層複雜的話，會增加 Gateway、Facade 層，或是我們組織獨有的 CoreService 層

另一個層級大部份 Java 組織會忽略的是 Domain Model 層，絕大多數 Java 開發者會開個 entity 或 model package，然後將所有的 Entity 往裡面丟。然而該 Entity 只是一堆欄位和 getter/setter 的堆疊，也就是單純的 Table 的對應物件而已， 不具備任何 business logic

	import java.lang.Exception

	/*
	Extra notes regarding Forth as expected by testcases:

	- words are case-insensitive, this interpreter normalizes all symbols to uppercase.
	- static scoping: when a word is being defined, the enviroment is kept as it is (i.e. closure required).
	- the word itself is not considered in the definition of that word
	(i.e. a previous definition of the same word may be picked)
	- primitive words and operations are subject to shadowing.

	/*
	1) Open https://popcat.click
	2) Open console (F12)
	3) Insert code & run
	*/


	var event = new KeyboardEvent('keydown', {
	key: 'g',
	ctrlKey: true