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A Proc object is an encapsulation of a block of code, which can be stored in a local variable, passed to a method or another Proc, and can be called. Proc is an essential concept in Ruby and a core of its functional programming features.
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Inside map, the block of code is treated as a regular (non-lambda) proc, which means that the internal arrays will be deconstructed to pairs of arguments, and return will exit from the method test. That would not be possible with a stricter lambda.
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In the GoodDog class, we're overriding the speak method in the Animal class because Ruby checks the object's class first for the method before it looks in the superclass. That means when we wrote the code sparky.speak, it first looked at sparky's class, which is GoodDog. It found the speak method there and used it. When we wrote the code paws.speak, Ruby first looked at paws's class, which is Cat. It did not find a speak method there, so it continued to look in Cat's superclass, Animal. It found a speak method in Animal, and used it. We'll talk about this method lookup path more in depth in a bit.
Inheritance can be a great way to remove duplication in your code base. There is an acronym that you'll see often in the Ruby community, "DRY". This stands for "Don't Repeat Yourself". It means that if you find yourself writing the same logic over and over again in your programs, there are ways to extract that logic to one place for reuse.
The above diagram shows what pure class based inheritance looks like. Remember the goal of this is to put the right behavior (i.e., methods) in the right class so we don't need to repeat code in multiple classes. We can imagine that all Fish objects are related to animals that live in the water, so perhaps a swim method should be in the Fish class. We can also imagine that all Mammal objects will have warm blood, so we can create a method called warm_blooded? in the Mammal class and have it return true. Therefore, the Cat and Dog objects will have access to the warm_blooded? method which is automatically inherited from Mammal by the Cat and Dog classes, but they won't have access to the methods in the Fish class.
Now that you have a grasp on both inheritance and mixins, let's put them both together to see how that affects the method lookup path. Recall the method lookup path is the order in which classes are inspected when you call a method. Let's take a look at the example code below.
The first use case we'll discuss is using modules for namespacing. In this context, namespacing means organizing similar classes under a module. In other words, we'll use modules to group related classes. Therein lies the first advantage of using modules for namespacing. It becomes easy for us to recognize related classes in our code. The second advantage is it reduces the likelihood of our classes colliding with other similarly named classes in our codebase. Here's how we do it:
The second use case for modules we'll look at is using modules as a container for methods, called module methods. This involves using modules to house other methods. This is very useful for methods that seem out of place within your code. Let's use our Mammal module to demonstrate:
We have made the human_years method private by placing it under the private method. What is it good for, then, if we can't call it? private methods are only accessible from other methods in the class. For example, given the above code, the following would be allowed:
The above code shows us that like private methods, protected methods cannot be invoked from outside of the class.However, unlike private methods, other instances of the class (or subclass) can also invoke the method.This allows for controlled access, but wider access between objects of the same class type.
This means that, if you accidentally override a method that was originally defined in the Object class, it can have far-reaching effects on your code. For example, send is an instance method that all classes inherit from Object. If you defined a new send instance method in your class, all objects of your class will call your custom send method, instead of the one in class Object, which is probably the one they mean to call. Object send serves as a way to call a method by passing it a symbol or a string which represents the method you want to call. The next couple of arguments will represent the method's arguments, if any. Let's see how send normally works by making use of our Child class:
Although writing automated tests may seem like an easy task for developers and engineers, there is still the possibility of ending up with poorly implemented tests and poor code maintainability. Trying to constantly deliver changes or features in any agile development project can prove to be costly when tests are involved. Changing one element on a webpage that 20 tests rely on will require going through these 20 test routines and updating each one to adapt to this change. This is time consuming and discourages developers from implementing automated tests early on.
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To grasp the concept better, use the examples provided below. Don't forget to open them in the code editor and play around a little. This way, you'll get a much better understanding of how everything works.
React is a JavaScript-based user interface library. React components are isolated reusable pieces of code logic with their own UI. Multiple components come together to create a meaningful working React application.
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RE: Calling Two functions on onSubmit. tsdragon (Programmer)14 Mar 02 21:04The same techniques can be used to call 3, or 4, or 5 functions. Adding them to the onSubmit gets cumbersome though, so I'd use the single onSubmit function that calls the other functions. It's more flexible.
function submitter()
if ( !radiomust() ) return false;
if ( !namemust() ) return false;
if ( !checkmust() ) return false;
if ( !selectmust() ) return false;
return true;
...
Tracy Dryden
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www.bydisn.com
Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard. RE: Calling Two functions on onSubmit. scripter73 (Programmer)15 Mar 02 10:15Thanks, Tracy,
However, I'm trying to say the following:
And if functiona returns a false, then I don't want the others to continue, etc. Everything works fine for functions a and b, but when I throw functionc in and start passing parameters to it, the code doesn't execute.
Thanks for your help. I hope I didn't confuse you. Please let me know if you'd like an actual sample. There's a trivial bit of Cold Fusion thrown into the parms.
scripter73

Change Your Thinking, Change Your Life.
RE: Calling Two functions on onSubmit. UNIMENT (Programmer)15 Mar 02 16:03scripter73: Then use iza's solution.
onsubmit="return functionOne() && functionTwo() && functionThree()"
The && operator will continue with execution only if the earlier expressions are true. RE: Calling Two functions on onSubmit. tsdragon (Programmer)16 Mar 02 10:59The code I gave for the submitter function will do the same thing. If a function returns false then so will the submitter function, otherwise it will continue and call the next function. If they all return true, the submitter function will return true. You can use more than one return in the onSumbit itself. iza's solution works, but as this thread illustrates, it gets cumbersome when you start adding additional functions.
Tracy Dryden
tracy bydisn.com
www.bydisn.com
Meddle not in the affairs of dragons,
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