Functor example does not make any sense

[alper]

In Functor there's:

const f = x => x + 1
const g = x => x * 2

some(1).map(x => g(f(x))) // = some(3)
some(1).map(f).map(g) // = some(3)

Especially the second but maybe both should by any reasonable intuition be 4?

Take some(1), map it through f, result 2, map it through g, result 4.

If for some reason this is different than reading order, then I would say that that reason is wrong.

Also I can't try this out because there's no REPL anywhere?

[CrossEye]

@alper: You're right. The example is wrong. Care to create a PR to fix it?

[marcwrobel]

Done in #240.