That's true. One can't possibly know everything about a language/framework before starting a project but I believe it is necessary to have a strong and deep knowledge of the language/framework in which the project is to be done.
Personally, I have stumbled while starting a project with half knowledge of the required language/framework and it usually leads to very bad code as well as design. One can surely learn a lot by getting their hands dirty and learn on the go but sometimes it is risky to make mistakes on certain project which are going to impact a lot of people due to broken or inadequate knowledge of the required language/framework.
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That's true. One can't possibly know everything about a language/framework before starting a project but I believe it is necessary to have a strong and deep knowledge of the language/framework in which the project is to be done.
Personally, I have stumbled while starting a project with half knowledge of the required language/framework and it usually leads to very bad code as well as design. One can surely learn a lot by getting their hands dirty and learn on the go but sometimes it is risky to make mistakes on certain project which are going to impact a lot of people due to broken or inadequate knowledge of the required language/framework.