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a lot of people are using JavaScript without understanding the method signatures of commonly using methods because JavaScript is such a weird and confusing language that has nonstandard method signatures for standard functions.

Those sound like two sides of the same coin.

A lot of people are using JavaScript expecting it to conform to the principle of least surprise. Map applies a function f to each element and returns the result. If you want to supply a second argument, you either have to partially apply the function or manually supply the arguments. JavaScript's map is different from what the rest of the world calls map, and that's the problem.

I would never have guessed that it was passing the index as a second parameter, I would have expected a compiler error.