Hi Will, If you think about currying <https://en.wikipedia.org/wiki/Currying> it starts to make more sense — at least that worked for me:
In add = x + y, for example, add 2 + 40 actually returns 42 (an Int) but add 2 returns function that takes one argument (Int -> Int). In other words: add takes only one argument, and returns a function that waits for the next argument… so Int -> Int -> Int If you pass just the first Int, it returns Int -> Int: > add x y = x + y <function> : number -> number -> number > addTwo = add 2 <function> : number -> number > add 40 2 42 : number > addTwo 40 42 : number Does that make sense? Eduardo Cuducos http://cuducos.me On Mon, Feb 13, 2017 at 4:42 PM Will Tian <will.w.t...@gmail.com> wrote: Hi, I am having trouble understanding the -> syntax in elm. For example if we have the function: plusTwo x = x + 2 it's type definition will be as follows: <function> : number -> number this is pretty straight forward however, if we have the function add x y = x + y its type definition is: <function> : number -> number -> number why is it not <function> number number -> number? What does -> denote exactly. Thanks in advance. -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to elm-discuss+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Elm Discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to elm-discuss+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
