8THE TYPE SYSTEM
Object-oriented programming is an exceptionally bad idea which could only have originated in California.
—Edsger Dijkstra
Up to now we’ve been using and creating a lot of functions. We can think of functions as the verbs of the Julia language. And just as in natural languages, verbs act on nouns. The nouns in Julia are numbers, collections, strings, and other instances of types.
We’ve encountered many data types in our journey up to this point: different varieties of numbers, strings, characters, and collections such as arrays and maps. Although our focus hasn’t been on types, it’s impossible to talk much about Julia programming ...
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