Object Oriented JavaScript - II

Dec 13, 2013Download as pptx, pdf

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Many developers cast off JS as a suitable OOP language because they are so used to the class style of C# and Java. Many people don't realize that JavaScript supports inheritance. When you write object-oriented code it instantly gives you power; you can write code that can be re-used and that is encapsulated. It includes functions and objects, prototype based programming, class based-prototype based, some hacks and exercises. The tutorial begins with a section about function and objects which includes a simple JS function, closures as one of the most powerful weapons for JS ninja, object as it is almost everything for a JS ninja, call and apply methods defined under functions. The function section is followed by the prototype section which includes a brief on class based vs prototype based. After this comes the hack section. It includes some hacks like appending new array to another array, swap variable values and many more. The last section of this tutorial is on exercises which includes some basic exercises like implementing basic inheritance, add forEach method, implement a function.

BEING A JS NINJA:
Object Oriented
JavaScript

Agenda
1. Functions & Objects
2. Prototype Based Programming
3. Class Based -Prototype Based
4. Method Overloading ?
5. Some hacks
6. Questions
7. Exercises!

Functions ( )
• A SimpleJS function:
• function multiply(a,b){
• return a *b;
• };
• A simple assert function
• Note: A method is a function defined inside an object as its property!

Functions ( )
• JavaScript only has Scope.
• A function has access to all the variables and functions in the scope in
which it isdefined.
• Lets see an example!
• http://jsfiddle.net/suroorwijdan/dr3Bb/2/

this & undefined
“JavaScript has two errors, thisand undefined and whenthisis undefined,
Oh Boy!” - Mikael Rogers
• http://jsfiddle.net/suroorwijdan/6gHjH/4/

Functions ( )
• Closures
• Closures are one of the most powerful weapons for a JS Ninja
• Closures allow a ninja to have access to a function scope with an
exported innerfunction
• http://jsfiddle.net/suroorwijdan/nz9bM/9/

Objects { }
• For a ninja almost everything is an object
• Creating an object:
• Using a Constructor -var obj =new Car();
• Using object initializer -var obj={};
• Using Object.create()
• http://jsfiddle.net/suroorwijdan/p5x2G/

Call and apply
• call() and apply() methods defined on functions allows a Ninja to
change the context in which the function is executed
http://jsfiddle.net/suroorwijdan/XzzU8/

Prototype {} - {} - {}
“Most Confused Upon Part for budding Ninjas”
http://jsfiddle.net/suroorwijdan/h74gd/

Class vs Prototype Based
Class Based(Java) PrototypeBased (JavaScript)
Class and instance are distinct entities All objects are instances
Define a class with a class definition; instantiate
a class with constructor methods
Define and create a set of objects with
constructor functions
Create a single object with the new operator Same
Construct an object hierarchy by using class
definitions to define subclasses of existing
classes
Construct an object hierarchy by
assigning an object as the prototype
associated with a constructor function.
Inherit properties by following the class chain. Inherit properties by following the
prototype chain
Class definition specifies all properties of all
instances of a class. Cannot add properties
dynamically atrun time
Constructor function or prototype
specifies an initial set of properties. Can
add or remove properties dynamically to
individual objects or to the entire set of
objects

Method Overloading ?
Can weimplementmethod overloading inJavaScript,
ifYes, thenHow?? :|
http://jsfiddle.net/suroorwijdan/3xLtY/

Some Hacks!
• Append new array to another array:
• var a =[4,5,6];
• var b =[7,8,9];
• Array.prototype.push.apply(a, b);
• Get TimeStamp with+
• +new Date();
• Access Strings with []just like charAt()
• var a =“This is mytrick”;
• a[0] ==‘T’ //true;

Some Hacks!
• Swap variable values:
• var a =10;
• var b =20;
• [a,b] =[b,a]
And many more :http://code.google.com/p/jslibs/wiki/JavascriptTips

Some More Concepts
• Memoization: “DIY”
• A memorize function is a higher order function which caches the result
returned by the function passed to it

Exercises
• Implement Basic Inheritance with the example of Employee
• Add a forEach method in the prototype of Array
• Implement a function which multiplies the largest number with the first
argument

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The following infograph talks about UX and the techniques of UX which can be used by a user for building smarter products which is important for enhancing user satisfaction. A user just cannot overlook experience design or UX while aiming to build smarter websites or applications. What is Experience Design or UX? UX design is the process of enhancing user satisfaction by improving usability, accessibility and pleasure emerging from the user and product interaction. Here are the 10 techniques of UX for building smarter products- Design real-time – Keeping in mind the micro interactions like content focused design, MAYA concepts etc. Know your audience – Match the layout, font styles, overall design aesthetics with the audience’s expectations and personality. Spontaneous Feedback – Use feedback messages to convey important information to users. Keep it simple and consistent – Make navigation simple, interactive and easy to understand. Design as per finger targets – While designing for small screens, give sufficient space to swipe and touch. And many more pointers like Implementing a visual hierarchy, checking for fold, simplifying your forms, collaborating to succeed and avoiding multiple actions. These are the 10 Pragmatic UX techniques for building smarter products like websites and applications which can help improve the user experience.

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Content migration to AEMTO THE NEW | Technology

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AWS CodeDeployTO THE NEW | Technology

AWS CodeDeploy is the new service announced at AWS re:Invent in Las Vegas!!! AWS CodeDeploy is a fully managed, scalable deployment service that lets AWS certified developers and engineers quickly and simply automate the process of deploying and updating applications on Amazon EC2. The presentation includes an introduction to Code Deploy, benefits of using Code Deploy, understanding various components and workflows of Code Deploy, ways to deploy an application, commands to create and push application using Code Deploy, steps to deploying code on instances, troubleshooting and limitations of Code Deploy. It begins with a section which gives a brief introduction to Code Deploy. The next section is about the benefits of using Code Deploy. It explains the benefits of using Code Deploy like automated deployments, centralized control etc. Specific to the benefits section comes components and workflows of Code Deploy. It briefly describes the components of Code Deploy like content, appsec file and also includes the steps to the workflow of Code Deploying. Then deploying an application which explains not just the steps to deploy an application but also answers what to deploy, how to deploy and where to deploy at the same time. Then, comes a section about commands used to create and push application. It tells about the commands which are not just used to create an application to s3 but also push applications to s3. Then it covers the steps for deploying code on instances. It becomes really interesting as it explains the steps a user can use to deploy codes on instances by just creating an application and following the other steps. The last section of this presentation is about the limitations and troubleshooting of Code Deploy. It tells about the troubleshooting which occurs while using Code Deploy and the troubleshooting which appears but also mentions the regions where Code Deploy is currently supported too.

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(AWS) Auto Scaling : Evening Session by Amazon and IntelliGrape SoftwareTO THE NEW | Technology

IntelliGrape Software in association with AWS presented an Evening Session on AWS CloudFront & Auto Scaling at Hyatt Regency, Delhi on 27th September. The event saw engagement from CEOs, CTOs and CIOs of e-commerce companies, start-ups and enterprises with a purpose to understand CloudFront and Auto Scaling better. Some of the fundamental questions every digital business, especially the infrastructure teams within the business, ask is cost, scale, speed, flexibility and wastage reduction. Agenda of the session was to share views and discuss on how AWS CloudFront & Auto Scaling endeavors to address these questions. The tutorial includes load scenarios, business scenarios, under/over provisioning, introduction to auto scaling, how auto works, points to remember, things to remember and snapshots. The tutorial begins with load scenario which includes the load scenarios of auto scaling like unpredicatable and predicable bursts. Following is a business scenario which includes different kinds of business scenarios. Alongside, there is a section about under/over provisioning. It includes over provisioning and under provisioning in respect to infrastructure and time. Furthermore, there's an introduction to auto scaling which includes auto scaling as a cloud computing service and some features. The next section is on working of auto scaling. It includes a brief about how auto scaling works for users and servers. Moreover, there is also a section on points to remember. It includes point which should be kept in mind while using auto scaling before scaling it down or out. An addition to this is a section on things to remember which includes things like launching, differentiating, scaling and regions. The last section of this tutorial includes snapshots taken from a conference held by TO THE NEW.

MongoDB using Grails plugin by puneet behlTO THE NEW | Technology

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Cloud FormationTO THE NEW | Technology

Introduction Benefits Concepts Templates CLI Tool Cloud Formation Demo Cloud Former (Intro) Questions The tutorial includes an introduction to Cloud formation, benefits to Cloud formation, concepts of Cloud formation, CLI tool, Cloud formation demo, introduction to Cloud former. The tutorial begins with an introduction to Cloud formation subsequent to which, there is another section talking about the benefits of Cloud formation. It also includes the services which are used by Cloud formation. The next section is based on the concepts of Cloud formation. This section is important as it explains the concepts of Cloud formation which are template and stack. The Template section includes the description, objects, sample template, parameters, resources, types of resources and also the steps to create a template. Whereas, the Stack section includes the collection of resources, resources which are created or deleted. Afterward comes the CLI Tool. This section includes the CLI tool called CFN. The CLI tool section is then followed by a Cloud formation demo. It not only gives a demo of Cloud formation and which templates would be useful. But, it also includes the issues which are present in the Cloud formation demo. The last section includes an introduction to Cloud former. It provides the description of Cloud former as to which tool and architecture it uses and also the things which are possible while using Cloud former.

BigData Search Simplified with ElasticSearchTO THE NEW | Technology

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JULY IN GRAILSTO THE NEW | Technology

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Getting groovier-with-vertxTO THE NEW | Technology

Demo application available at https://github.com/hiteshBhatia/vertx-imagetransformation.git It includes inroduction to VERTX, key advantages and concepts, internals and demos. It begins with an introduction to VERTX section which includes an introduction to VERTX and its features. It also includes reasons of using VertX. Following is a section on key advantages and concepts. It includes advantages of using VertX like nature, scalability etc. It also includes key concepts like verticle, event bus, event loop, worker thread, module and how VertX works on these concepts. In addition to this, there is a section on internals and demos which includes open source projects, demo applications, architecture of these demo applications in form of producer, queue, consumers, workers, event bus. The last section of the tutorial covers up a summary section. It includes a brief summary of VertX and pointers to look something forward to like integration, language support, creation of modules etc.

Introduction to KanbanTO THE NEW | Technology

In this presentation, Roni explains the basics of Kanban and the principles governing the application of Kanban for process improvement. We also look at a comparison between Scrum and Kanban and visit the basic differences between them. It includes pointers telling what’s wrong with the current system, history of Kanban, introduction to Kanban, benefits of using Kanban, practices used in Kanban, principles of Kanban, how is Scrum different from Kanban. The tutorial begins with details about the current system and what’s wrong with it. It includes pointers like burnout, low throughput, unidentified bottlenecks, too much work which tell what’s wrong with the current system. Followed by is a section about the history of Kanban which includes points like how the name originated, who discovered it, design, visual signals, based on which system. Resulting in an introduction section which talks about Kanban, what method it uses, scheduling system, what it consists of, amount of work, identification etc. Next comes the benefits section which includes the benefits of using Kanban like helps in visualizing the system, allows to evaluate, identify bottlenecks, establish trust in process etc. Afterwards there is a section about Kanban practices. It includes practices used in Kanban like visualize, limit WIP in each phase of development, managing flow by keeping it under monitor, make policies explicit, improve collaboratively through the use of scientific models and some terms like lead time, cycle time, throughput etc. Moreover, it also includes the board for easy visualization, story card for keeping track, charts for measurement, control charts to measure average time taken for each task, cumulative flow diagrams showing relative amount of work. Then comes the principles of Kanban. It includes principles which should be used in Kanban like agree to pursue incremental, evolutionary change, optimize what already exists, respect the current process, roles, responsibilities, leadership at all levels to empower the workforce to bring about change. The last section of this tutorial is Scrum vs Kanban. It explains how scrum is different from Kanban by giving pointers like Scrum prescribes roles, time boxed iterations, backlog items must fit, limit WIP in a different way. It also includes pointers giving reason why it shouldn’t matter because emphasis should be on the goal and not the tool.

Introduction to HerokuTO THE NEW | Technology

This document provides an introduction and overview of Heroku, an application deployment platform. It describes how Heroku allows developers to deploy and scale web apps through a process model using dynos and dyno manifolds without having to manage servers. Developers can use Heroku's command line interface to deploy apps through git pushes, connect add-on services, view logs, and manage dynos. Heroku also offers usage-based billing and free dyno hours for basic usage.

10 Best Node.js Practices you Need to Know!TO THE NEW | Technology

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Object Oriented JavaScript - II

2. BEING A JS NINJA: Object Oriented JavaScript

3. Agenda 1. Functions & Objects 2. Prototype Based Programming 3. Class Based -Prototype Based 4. Method Overloading ? 5. Some hacks 6. Questions 7. Exercises!

4. Functions ( ) • A SimpleJS function: • function multiply(a,b){ • return a *b; • }; • A simple assert function • Note: A method is a function defined inside an object as its property!

5. Functions ( ) • JavaScript only has Scope. • A function has access to all the variables and functions in the scope in which it isdefined. • Lets see an example! • http://jsfiddle.net/suroorwijdan/dr3Bb/2/

6. this & undefined “JavaScript has two errors, thisand undefined and whenthisis undefined, Oh Boy!” - Mikael Rogers • http://jsfiddle.net/suroorwijdan/6gHjH/4/

7. Functions ( ) • Closures • Closures are one of the most powerful weapons for a JS Ninja • Closures allow a ninja to have access to a function scope with an exported innerfunction • http://jsfiddle.net/suroorwijdan/nz9bM/9/

8. Objects { } • For a ninja almost everything is an object • Creating an object: • Using a Constructor -var obj =new Car(); • Using object initializer -var obj={}; • Using Object.create() • http://jsfiddle.net/suroorwijdan/p5x2G/

9. Call and apply • call() and apply() methods defined on functions allows a Ninja to change the context in which the function is executed http://jsfiddle.net/suroorwijdan/XzzU8/

10. Prototype {} - {} - {} “Most Confused Upon Part for budding Ninjas” http://jsfiddle.net/suroorwijdan/h74gd/

11. Class vs Prototype Based Class Based(Java) PrototypeBased (JavaScript) Class and instance are distinct entities All objects are instances Define a class with a class definition; instantiate a class with constructor methods Define and create a set of objects with constructor functions Create a single object with the new operator Same Construct an object hierarchy by using class definitions to define subclasses of existing classes Construct an object hierarchy by assigning an object as the prototype associated with a constructor function. Inherit properties by following the class chain. Inherit properties by following the prototype chain Class definition specifies all properties of all instances of a class. Cannot add properties dynamically atrun time Constructor function or prototype specifies an initial set of properties. Can add or remove properties dynamically to individual objects or to the entire set of objects

12. Method Overloading ? Can weimplementmethod overloading inJavaScript, ifYes, thenHow?? :| http://jsfiddle.net/suroorwijdan/3xLtY/

13. Some Hacks! • Append new array to another array: • var a =[4,5,6]; • var b =[7,8,9]; • Array.prototype.push.apply(a, b); • Get TimeStamp with+ • +new Date(); • Access Strings with []just like charAt() • var a =“This is mytrick”; • a[0] ==‘T’ //true;

14. Some Hacks! • Swap variable values: • var a =10; • var b =20; • [a,b] =[b,a] And many more :http://code.google.com/p/jslibs/wiki/JavascriptTips

15. Some More Concepts • Memoization: “DIY” • A memorize function is a higher order function which caches the result returned by the function passed to it

16. Exercises • Implement Basic Inheritance with the example of Employee • Add a forEach method in the prototype of Array • Implement a function which multiplies the largest number with the first argument

17. Contact us Our Office Client Location We are experts in MEAN stack framework to build scalable web apps Click Here To Know More! Have more queries related to MEAN? Talk To Our Experts

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