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But what's the value of this arithmetic muscle memory, in a world of ubiquitous computing?

It’s the same as knowing the editor commands, of whatever text editor you’re using, so that you don’t have to look them up constantly while working. It’s the same as knowing the basic functions and methods of the libraries and frameworks you use so that you can type them quickly without going to look them up.

Auto completion is a powerful tool but, in general, it’s not very helpful if you don’t know at least a prefix of the name of the function you’re looking for.

Basic arithmetic skills are like math literacy. If you’re constantly having to look words up in the dictionary then you probably won’t get through Lord of the Rings.



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