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Duplicate is definitely something we are trying to get rid of, however, what’s the cost of abstraction? It seems some problem we could think for a while.

We should think of the tradeoff between code duplication and increased level of abstraction.

1. Definition - cost of abstraction

• An abstraction is adding to the cognitive load of whoever works with the code
• The main cost of abstraction: separating the implementation from the specification. Or we say separate the letter of function from the spirit of the function
• The former being what the function does, the latter being what everybody believes it should do
• Should involve everybody to consider what the code does, or we say what the function does

2. Thought

• The decision about creating an abstraction should not be taken lightly.
• There’s a large social cost to every abstraction, may lead the project to be unmaintainable.
• lambda is also a way to reduce the abstraction layers in some way
• Abstraction is a good way to get rid of verbose code, but itself may bring uncertainty to some extent. Only implement necessary abstraction.

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