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so most important thing is to code for readability. never, ever code for efficiency. ever.
Breh, I don't know who told you that but that is not true. In most cases, that would be correct but sometimes efficiency matters and is priority. There are times where there are hardware limitations or running time is absolutely critical.
That being said, you can be efficient and maintain proper standards as far as readability and scaling goes. Not always, but mostly.