Abstraction: Difference between revisions
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* A programming language can be fairly simple, but it translates the instructions you write into machine code, which is impossibly complex | * A programming language can be fairly simple, but it translates the instructions you write into machine code, which is impossibly complex | ||
== Explain why abstraction is required == | |||
You must decide '''at what level should I abstract a problem and solution'''. Abstraction is required because life is complex. We need to simplify complex systems so people can understand and use them. | |||
For example, a student is building a software program to help students pick the right college. The student uses SAT score to determine a good match. The student has '''abstracted''' complexity when it comes to choosing a college. There are actually many factors in choosing a college, but the student has chosen to focus on SAT scores. | |||
== Construct an abstraction == | |||
I want to launch a missile, loaded with 10,000 liters of peanut butter, at my friend because it would be funny. There are hundreds of important variables associated with launching, flying, and hitting a target in this example. Please think for a moment how we could construct an abstraction. | |||
We could create a giant red button with the words "launch peanut butter missile at friend" which would launch the missile. However once this button was pushed a VERY COMPLEX process would begin to launch the missile. | |||
== Distinguish between a real-world entity and its abstraction == | |||
Please refer to the missile example above. | |||
== Do you understand this? == | == Do you understand this? == | ||
Revision as of 14:57, 26 July 2017
This is an important concept. You should fully understand this.
In software engineering and computer science, abstraction is a technique for arranging complexity of computer systems. It works by establishing a level of complexity on which a person interacts with the system, suppressing the more complex details below the current level.[1]
Identifying examples of abstraction[edit]
(awaiting permission to post material)
Anytime you see a simple interface covering a more complex system, you should think "abstraction".
- A car is a very complex machine but the interface is simple (a steering wheel, a gas pedal and a gear shift)
- A video game controller only has a few buttons, but underneath the controller is complex control mechanism
- A programming language can be fairly simple, but it translates the instructions you write into machine code, which is impossibly complex
Explain why abstraction is required[edit]
You must decide at what level should I abstract a problem and solution. Abstraction is required because life is complex. We need to simplify complex systems so people can understand and use them.
For example, a student is building a software program to help students pick the right college. The student uses SAT score to determine a good match. The student has abstracted complexity when it comes to choosing a college. There are actually many factors in choosing a college, but the student has chosen to focus on SAT scores.
Construct an abstraction[edit]
I want to launch a missile, loaded with 10,000 liters of peanut butter, at my friend because it would be funny. There are hundreds of important variables associated with launching, flying, and hitting a target in this example. Please think for a moment how we could construct an abstraction.
We could create a giant red button with the words "launch peanut butter missile at friend" which would launch the missile. However once this button was pushed a VERY COMPLEX process would begin to launch the missile.
Distinguish between a real-world entity and its abstraction[edit]
Please refer to the missile example above.
Do you understand this?[edit]
Standards[edit]
- Identify examples of abstraction
- Explain why abstraction is required in the derivation of computational solutions for a specified situation
- Construct an abstraction from a specified situation
- Distinguish between a real-world entity and its abstraction