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Comment by gpderetta | Hacker News Reader

Nice.

I was going to say that it is unreadable, after spending a bit trying to understand it, (for someone that knows no ocaml) it actually is not. Only things I'm unsure are the ~ symbol and <-. What do they do?

edit: <- is just mutating assignment. I thought that ~ introduced named arguments but doesn't seem right.

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~ does indeed denote named arguments. To call a function named f which has an argument named arg with arg set to the value x, the syntax is:

    f ~arg:x

But what about ~buf here:

  let len = Core.In_channel.input in_ch ~buf ~pos:0 ~len:buf_size

~buf is shorthand for ~buf:buf

Oh, nice.

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