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How does the law of Demeter apply to functions?
More formally, the Law of Demeter for functions requires that a method m of an object O may only invoke the methods of the following kinds of objects: In particular, an object should avoid invoking methods of a member object returned by another method.
When did Ian Holland come up with the law of Demeter?
The guideline was proposed by Ian Holland at Northeastern University towards the end of 1987, and can be succinctly summarized in each of the following ways: Each unit should have only limited knowledge about other units: only units “closely” related to the current unit. Each unit should only talk to its friends; don’t talk to strangers.
What’s the difference between Tell Don’t Ask and Demeter?
“Tell don’t ask” is a bit different. Demeter: don’t get something to get something from that to do something on the final thing. TDA: don’t retrieve “information” from another object to then make a decision on that. Simple example:
How is the Lod a case of loose coupling?
In its general form, the LoD is a specific case of loose coupling. The guideline was proposed by Ian Holland at Northeastern University towards the end of 1987, and can be succinctly summarized in each of the following ways: Each unit should have only limited knowledge about other units: only units “closely” related to the current unit.
How does a controller communicate with a model?
First, the Model object is made in the Controller and then it is passed to View. We can pass the data or communicate from Model to View by these three steps: Take the object in the action of a Controller. Pass Model object as a parameter to View.
How do you communicate from view to controller?
To communicate from View to Model, you have to follow the path: View > Controller > Model. You can’t directly move from View to Model. First, you have to submit data to the Controller and then pass it to Model.