Sure, but you're putting a workaround in – there really shouldn't be any need for that no-op arrow function. But you do actually need it in order to drop all but the first arguments.

This is simple, straightforward, and wrong:

    ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"].map(parseInt)

This doesn't work because map() stuffs a counter into the second argument of parseInt(), which is expecting a radix for its second argument. So the iterations of the map go like this:

    parseInt("1", 0)
    parseInt("2", 1)
    parseInt("3", 2)

…and so on, which obviously gives garbage results. JavaScript is littered with these kinds of weird edge cases. Even your example with the workaround isn't 100% reliable, it's browser-dependent – when you have leading zeros in your strings, some browsers will interpret them as octal, and some won't.