A good reason to wait until you have three or more repetitions is that it helps you prevent writing abstractions that take ten arguments.
*You may think "oh, this code here repeated here, and here" so you write an abstraction. Then you add a third variation, and realize you need a height argument, so you redefine it with a default of None. Then repetition four requires a colour. And before you know it, your abstraction ends up with 10 different branches and becomes 🍝.
On the other hand, if you do write it in different places, you'll see what the differences are, and maybe abstract it into 3 didn't functions that only do one thing, so you don't end up with abstractions that you end up refactoring anyways.
(*Impersonal you - not saying you're guilty of that, as it gets easier to predict with experience, but good habit to develop early on).
This is very well put. There are many ways to abstract something and you don't know what the best abstraction is going to be until you have a large enough sample of sub-problems to be able to make an informed decision.
Choosing the wrong abstraction is costly and leads to complexity bloat because developers have a natural tendency to keep adding new abstractions on top instead of refactoring or deleting existing ones.
Also, every time you invent a new abstraction to reduce repetition, you introduce one more concept that people have to learn in order to make sense of your code and it adds up; especially if the abstractions are contrived technical concepts and not strongly rooted in an underlying business domain.
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A good reason to wait until you have three or more repetitions is that it helps you prevent writing abstractions that take ten arguments.
*You may think "oh, this code here repeated here, and here" so you write an abstraction. Then you add a third variation, and realize you need a height argument, so you redefine it with a default of
None. Then repetition four requires a colour. And before you know it, your abstraction ends up with 10 different branches and becomes 🍝.On the other hand, if you do write it in different places, you'll see what the differences are, and maybe abstract it into 3 didn't functions that only do one thing, so you don't end up with abstractions that you end up refactoring anyways.
(*Impersonal you - not saying you're guilty of that, as it gets easier to predict with experience, but good habit to develop early on).
This is very well put. There are many ways to abstract something and you don't know what the best abstraction is going to be until you have a large enough sample of sub-problems to be able to make an informed decision.
Choosing the wrong abstraction is costly and leads to complexity bloat because developers have a natural tendency to keep adding new abstractions on top instead of refactoring or deleting existing ones.
Also, every time you invent a new abstraction to reduce repetition, you introduce one more concept that people have to learn in order to make sense of your code and it adds up; especially if the abstractions are contrived technical concepts and not strongly rooted in an underlying business domain.