Start by implementing the problem in the concrete, not in the abstract. Don't try to guess what interfaces you will need. Discover them.
Only after implementing the problem in the concrete, go on to decoupling. Ask yourself: "What do I need to decouple to make it better, to allow it to deal with change as the data or business changes?".
Leaving the code in the concrete is also an option. Don't force abstractions when they are not necessary. Prefer duplication over the wrong abstraction because duplication is cheaper to deal with.
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In the long run, it's better to fix wrong abstractions ASAP than to add more code and make everything more complicated.
Your goal is to remove the abstraction and conditionals, and to reduce each caller to only the code it needs. Here's how:
Once done, you can start anew, re-isolating duplication and re-extracting abstractions.
"Don’t repeat yourself" (DRY) is usually good advice, but you have to get the abstractions right. Otherwise they quickly become unmaintainable.
Here's how it usually plays out:
Loop these steps a couple of times and you quickly get an unmaintainable mess.
If you find yourself passing parameters and adding conditional paths through shared code, the abstraction is wrong. It's no longer right for the codebase.
Wrong abstractions are no longer common abstractions; they are series of conditions mixed with vaguely related ideas. This makes them:
Waiting around often means you’re not happy with any of the options, because they’re not right for who you are. So, when you find yourself stuck between possibilities, think about what you really want.
For example, if you’re unsure about a career change, ask yourself what it is that appeals to you about your current position and the one you’re debating.
The more you work, the less effective and productive you become over both the short and long term .
It’s important for us not to overwork ourselves and get enough sleep to maintain a high level of productivity.
The user is not an expert. My doc doesn't require me to know the difference between low-density and high-density lipoproteions.
Don't assume user should know what kind of browser they use or what is the best flow to use the app.
But yes, no matter how much you think of it, sometimes the user demand feature that seem pointless and he can have difficulties with functions that seem to be self-explanatory.
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