Revealing Module Pattern in JavaScript, Jquery, for AEM Client Libraries

The IIFE contains a private ‘person’ object and a private function ‘addProperty’ that accepts a property name and a property value. Now that we have the fundamentals of IIFE in place, let us look take a step-by-step approach to create a module pattern. I will strongly recommend that you spend a few minutes to read this article to understand what an IIFE is. The Module pattern is based on IIFE and hence it will give you the right foundation before proceeding further. Any functions we don’t explicitly return can only be accessed inside the IIFE itself. We’ll create a few libraries from these functions, using different programming patterns and techniques.

  • Making long story short, I got a chance to jump from DevOps to Software Development .
  • Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
  • Someone could come along and invoke it again, creating a new musicPlayer.
  • This is where the Module comes in to save us, by allowing us to define all our “private” stuff locally and only return “the good parts”.
  • These are also known as Immediately-Invoked-Function-Expressions, in which the function creates new scope and creates “privacy”.

For example, the previous code uses myCalc to call the Calculator object’s init() function. Now that we have a good understanding of closure, the prototype pattern, and the module pattern, let us now take a look at the JavaScript Revealing Module Pattern. You know it’s funny, we have all this verbiage to describe these patterns, and you might be scratching your head as to what a module pattern vs a revealing module pattern is.

Since it has no name, it can never be invoked elsewhere. Now that we’re a little more familiar with the Module pattern, let’s take a look at a slightly improved version—Christian Heilmann’s What Are the Easiest Tech Jobs To Get Into. Get full access to Learning JavaScript Design Patterns and 60K+ other titles, with free 10-day trial of O’Reilly.

Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Let’s look at a more Object Literal syntax, and a perfectly good Module Pattern and the return keyword’s role. Usually a Module will return an Object, but how that Object is defined and constructed is totally up to you. Depending on the project and the role/setup of the code, I may use one of a few syntaxes. Typical Modules will use return and return an Object to the Module, to which the methods bound to the Object will be accessible from the Module’s namespace.

He also disliked the Module pattern’s requirement of having to switch to object literal notation for the things he wished to make public. The Revealing Module Pattern is one of the most popular ways of creating modules. Using the return statement we can return a object literal that ‘reveals’ only the methods or properties we want to be publicly available. One way we can get around this issue is by using the revealing module pattern.

The first one, doPriv, simply wraps a call to the private method. The second public method, pub1, just returns the number 2. Finally, testpub, just makes use of pub1 and multiplies it by two. Basically, we’ve created a module that’s accessible globally while protecting the private members and functions that we do not want to expose. One advantage of the revealing module pattern is that you can include functions and variables that are private, and cannot be accessed or used outside of the library.

When I first read about this pattern, I really didn’t think much about it. But after seeing the change to my Diary module, it just… Find the right learning path for you, based on your role and skills. Take part in hands-on practice, study for a certification, and much more – all personalized for you. I really like the above syntax, as it’s very declarative. For bigger JavaScript Modules this pattern helps out a lot more, using a standard “Module Pattern” can get out of control depending on the syntax you go for and how you structure your code.

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Change members from public to private or vice versa by modifying a single line, without changing the function body. Can be repurposed to return any of the previously mentioned Patterns yielding the advantages of other patterns while mitigating the disadvantages. For this solution, we will create a Script Include which can be accessed by all Scopes but is ultimately Protected to mask the source code when purchased from the store. The team is concerned about granting direct table access to users since at best some data will make no sense to the user and at worst, random table edits could corrupt the application data. To remedy this, the team has locked all tables within the scope to only allow access via a Script Include API.

  • What if you wanted to have people call that function using blastoff instead of gofast?
  • As a result of this, modules created with the Revealing Module pattern may be more fragile than those created with the original Module pattern, so care should be taken during usage.
  • If the Revealing Module pattern makes that easier to avoid, then it is yet another reason to consider it.
  • I’ve got a simple module here called revealModuleTest.

However, I find myself wanting to use it like a class, so I’m … Revealing pattern, or not revealing pattern we are still using a module pattern, and hiding access to some methods/variables. Which means we are going to run still in problems when it comes to patching or extending the module. You can use the revealing module pattern in JavaScript to maintain private information using closures while exposing only what you need. You’ll then see on the last line inside the Module that myObject is returned. Our global Module doesn’t care that the locally scoped Object has a name, we’ll only get the actual Object sent back, not the name.

Use new with the Revealing Module Pattern if you like!

Strict mode will protect you from some of the more dangerous parts in JavaScript. Yes, if that logic changed, you’d write more tests and adjust your other test. What gets returned isn’t a flat answer though so «no» data isn’t valid in our case. What you don’t care about is what happens in ‘diaryModule.somethingElse’ but you could definitely care your method called the right other method. I’ve implemented moving and resizing square boxes by module pattern. Notice that callChangeHTML binds to the returned object and can be referenced within the HTMLChanger namespace.

revealing module pattern

Since in the all functions are implemented in the private scope, this issue is cleanly avoided. If you look at the return statement, the values of variables and functions can be returned in a conventional JavaScript way. We are using the addProperty, removeProperty, and displayPerson as pointers to the private functions. Our function-level scope still keeps our methods and variables public and private based on whether we expose them in the return object.

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I have over a decade of overall web engineering experience and many years of AEM experience in practice. I hope to give back to the AEM Full Stack Development community by sharing my knowledge with the world. In this example, I have incorporated the best practices, and used special naming conventions, so that the code is organized, and set for scalability.

  • JavaScript does not have a private keyword by default but using closures we can create private methods and private state.
  • As you can see your code has become more readable now, since your event bindings are at top and their respective functions are at bottom.
  • (See my review here.) In this blog entry I’ll be discussing the Revealing Module pattern.

But we can’t fiddle with our songList or access the loadSong() method. The benefit to the Revealing Module Pattern is that we can look at the bottom of our modules and quickly see what is publicly available for use. «I don’t care where the data came from so long as it equals my mock data and ‘whatever’ is set properly.» I don’t care where the data came from so long as it equals my mock data and ‘whatever’ is set properly. I didn’t see the code when I read it (RSS feed didn’t include it) but I use that pattern often as well.

JavaScript Revealing Module Pattern

I also like the fact that it doesn’t separate code into constructor and prototype sections. Although it doesn’t offer the benefit of sharing functions implementations across objects How To Open Aws Free Tier Account Solved 2022 Login Solution through JavaScript’s prototype feature, it’s definitely a viable option. It’s harder to patch public methods and variables that are referred to by something private.

These are also known as Immediately-Invoked-Function-Expressions, in which the function creates new scope and creates “privacy”. JavaScript doesn’t have privacy, but creating new scope emulates this when we wrap all our function logic inside them. The idea then is to return only the parts we need, leaving the other code out of the global scope. In Revealing Module pattern, we define functions in closure area and only use variable names in returning object. The revealing module pattern is used to provide an abstraction over private implementations by providing public APIs. We return a public method ‘callAddPropertyFn’ from the IIFE.

Clipboard support in jQuery using revealing module pattern

There are many different variations of the module pattern so for now I will be covering the basics and the Revealing Module Pattern in ES5. I’ve got a simple module here called revealModuleTest. (And yes, this isn’t a «real world example», but I wanted to demonstrate the issue with a simple block first.) My module has one private method, and three public methods.

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