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hu - Easy Learning Design Patterns Javascript: Build Better Coding and Design Patterns

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Easy Learning
Design Patterns Javascript
YANG HU Simple is the beginning of wisdom This book briefly explain the - photo 1
YANG HU
Simple is the beginning of wisdom. This book briefly explain the concept, and vividly cultivate programming interest, this book deeply analyzes Design Patterns Javascript, you will learn it easy fast and well.
http://en.verejava.com
Copyright 2019 Yang Hu
All rights reserved.
ISBN : 9781099972591
Download Javascript Desgin Pattern Image.zip all images for this book.
http://en.verejava.com/download.jsp?id=1
CONTENTS
.
Strategy Pattern Principle
Strategy Pattern : Encapsulates an algorithm inside a class. Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from clients that use it.
. Calculate Strategy Addition, subtraction, multiplication, division
1 Create a TestStrategy1html with Notepad and open it in your browser - photo 2
1. Create a TestStrategy1.html with Notepad and open it in your browser
type ="text/javascript" >
function Addition(){
this.caculate = function ( a, b){
return a + b;
}
}
function Subtraction(){
this.caculate = function ( a, b){
return a - b;
}
}
function Multiplication (){
this.caculate = function ( a, b){
return a * b;
}
}
function Division(){
this.caculate = function ( a, b){
return a / b;
}
}
function Context( strategy){
this.strategy = strategy;
this.caculate = function ( a, b){
return this.strategy.caculate( a, b);
}
}
var context = new Context( new Addition());
var result = context.caculate( 4 , 2 );
document.write( result + "
" );
var context = new Context( new Subtraction());
var result = context.caculate( 4 , 2 );
document.write( result + "
" );
var context = new Context( new Multiplication());
var result = context.caculate( 4 , 2 );
document.write( result + "
" );
var context = new Context( new Division());
var result = context.caculate( 4 , 2 );
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