functional programming gui

So far, in each installment of this series, I've explained why it's important to understand functional programming. However, some of the reasons are explained in a number of articles, and only in the larger context of a comprehensive approach can we fully understand these reasons. In this installment, I'll explore all the reasons why functional

As a professional programmer, we often create a library of tools because of our work needs. The so-called tool Library is a function library composed of a set of functions, which is pre-compiled for some common problems that are often encountered at work. Typically, the functionality of these libraries is implemented by a series of functions around these data types, supported by some specially tailored data types. Within the scope of functional

be read into the first line of the file and then emit output. In addition to the recursive algorithm, it is remembered that functional programming features program operations in State machines. In the above example the results of the operation in addition to the output value of line there is a next state next. Take a look at the following component: Status carry, output PROCESS[F,O2] final def Drain[o2]:

Functional Programming (1) Understanding of the "Programming Paradigm" and "functions", and the Function Recognition Programming Paradigm Programming paradigm) The programming paradigm refers to the idea and perspective of

I've been using Scala for a year or two, and the language seems to have a magical power that people don't want to let go of when they use it. Scala has had a very profound impact on my entire program life, and I learned about functional programming, so I know that there is an elegant, efficient, powerful language in the world.Scala is very popular abroad, but somehow it's always tepid at home, and I want to

1. First, let's look at my needs, as follows:control text box can only enter numeric characters2. Source code: Packagecn.itcast_07;Importjava.awt.FlowLayout;ImportJava.awt.Frame;ImportJava.awt.Label;ImportJava.awt.TextField;ImportJava.awt.event.KeyAdapter;Importjava.awt.event.KeyEvent;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.WindowEvent;/** If you enter a non-numeric character, the effect of your keyboard entry will be canceled. */ Public classFramedemo { Public Static voidMa

. Similarly, a write-only resource instance is as follows:Case Class Resourcew[r,i,i2] ( //write-only resource acquire:io[r], //Resource Usage portal, resource handle release:r = io[ Unit], //cleanup function rcvf:r = (I2 = Io[unit]),//Receive mode TRANS:PROCESS[I,I2] //process ) extends sink[ I] { def This is similar to Resourcer. Or is connected to the process in the opposite direction: from P to trans. The following is a sink component that writes to a file:Object Sink {Impor

1. First: Menu componentsMenubar,menu,menuitemCreate a menu bar, create a menu, and set up menu items in each menu.The menu can also be added to the menu as a submenu.Add a menu to the frame by using the Setmenubar () method.2. Case code: Packagecn.itcast_08;Importjava.awt.FlowLayout;ImportJava.awt.Frame;ImportJava.awt.Menu;ImportJava.awt.MenuBar;ImportJava.awt.MenuItem;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.Wi

1. First we look at our needs, as follows:Enter "Wind", click "Data Transfer", such text will appear in the following text field, this is our needs.2. The code is as follows: Packagecn.itcast_05;ImportJava.awt.Button;Importjava.awt.FlowLayout;ImportJava.awt.Frame;ImportJava.awt.TextArea;ImportJava.awt.TextField;Importjava.awt.event.ActionEvent;ImportJava.awt.event.ActionListener;ImportJava.awt.event.WindowAdapter;Importjava.awt.event.WindowEvent; Public classFramedemo { Public Static voidMain (s

1. Component Inheritance diagram:2. Analyze the above component inheritance diagram(1) Component:public abstract class Component extends Object implements ImageObserver, Menucontainer, Serializablecomponent is a graphical representation of objects that can be displayed on the screen and interact with the user. Buttons, checkboxes, and scroll bars in a typical graphical user interface are examples of components. Component The Toolkit class is an abstract superclass of a menu that is not related

As a kind of structured programming, functional programming is being paid more and more attention. Project is not just object-oriented programming, more people try to start using functional programming to solve problems encountere

Http://blog.zhaojie.me/2010/05/trends-and-future-directions-in-programming-languages-by-anders-3-functional-programming-and-fsharp.html This is the opening speech by Anders hejlsberg at techdays 2010, Belgium.Since I have discussed many languages in my blog recently, I plan to write the Anders speech in full out of context. In the previous section, Anders explain

See http://blog.zhaojie.me/2010/05/trends-and-future-directions-in-programming-languages-by-anders-3-functional-programming-and-fsharp.html This is the opening speech by Anders hejlsberg at techdays 2010, Belgium. Since I have discussed many languages in my blog recently, I plan to write the Anders speech in full out of context. In the previous section, Anders el

Chain programming and functional programming, chain programming functions Speaking of chain programming and functional programming, Do not be nervous. This is actually the case when I l

Short, object-oriented programming is to wrap a class class outside of a function program, and then point the class to an objectAnd the functions in class are called methods here.As an example:Use functional programming to write a script that sends a message in one click:def e_mail (email,message): print (' mail sent ... ') return truee_mail (' [email prote

is also possible to use recursion as a control process. The code that is programmed by functional programming is relatively much less and more concise.Object-Oriented Programming: Object-oriented has three main characteristics, namely encapsulation, inheritance and polymorphism. The description of the class shows the encapsulation, class as an object template, c

After more than 50 years of birth, functional programming (functional programming) began to gain more and more attention.Not only did the oldest functional language Lisp regain their youth, but new functional languages such as Erl

The so-called imperative programming, is the command-oriented, to the machine to provide one after another command sequence to make it intact execution. The efficiency of program execution depends on the number of execution commands. Therefore, large o notation and so on represent the time space complexity of the symbol.Functional languages are not "programmed by function transformations" in the usual sense. Notice that there is no variable in pure

Functional programming is no longer a new concept. In addition, functional programming is suspended from time to time on various technical forums and news websites. However, for many programmers who write applications, functional program