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Then you read it as assignment. It's a bit unfortunate that it means something else in mathematics. Pascal used := as the assignment operator, and used = as the equal test. It could also do 1-based indexing of arrays, which is another classic pain point when you start programming with just a tiny bit too much knowledge.

What about x=x+1 ?

IIRC, the assignment notation mas annoying to me at the very beginning.

All I know that R's assignment notation, `<-`, bugged the hell out of me after years of equals-sign-assignment...but after playing around with R, I naturally and accidentally use `<-` in Python and other traditional assignment languages.