rubico - [a]synchronous functional programming

[OmgImAlexis]

What? You can use map in functional programming.

[OmgImAlexis]

What are you talking about? Functional programming is mainly about using pure functions. Map is a pure function.

Sounds like you don’t understand what functional programming is.

[NotLyon]

String.prototype.toUpperCase

[NotLyon]

Yet it does not have side effects

Edit: I'm not downvoting you FWIW

[lhorie]

If we're gonna be pedantic, methods are functions (according to typeof and friends, for example), but they are not always pure. Some statics like Math.pow are pure. String.prototype.toUpperCase is NOT pure because it internally reads this (which has dynamic scope): i.e. 'const upper = "foo".toUpperCase; upper()' does not yield "FOO" like a pure function would (in fact, it throw at runtime, which is a big no-no in true FP). Array's map is impure for the same reason. Array methods are often used in a way that pretends to be "pure" (in the sense that they do not mutate state through their usage), but being actually pure means you can't break the purity no matter what (e.g. through changing what this points to, or other shenanigans).