How do I create a function that can take either positional or keyword arguments? Right now, I have a function that takes keyword arguments. But, I would to revise it to take either positional or keyword arguments. Thanks.

@mbauman : I tried to replicate the same function in Atom.But, it did not run. Any idea? Thanks. f(; x::Int=throw(ArgumentError("missing x"))) return(x) end I got this error message; syntax: keyword argument is not a symbol: "x::Int" in include_string(::String, ::String) at loading.jl:441 in …

You’re missing the function (or to do like the example, where the function was defined in a short form using = x).

This tryFunction approach works, of course. There is nothing wrong with it :slight_smile: I was just curious of why you wanted to achieve this design.

@mkborregaard : oh, my bad. So, that works without function in REPL , but in ATOM?? Thanks.

@mkborregaard : I just wanted to have that flexibility in case people would ask. I love Julia language, and I would like to give people no chance to discard the fact that this is an awesome language Thanks.

It’s not about the REPL or Atom. It is simply that there are two ways of defining a function: f(x) = println(x) # or function f(x) println(x) end They are equivalent. But you tried a mix between the two, e.g. you tried something like this: f(x) println(x) end That doesn’t work.

I’ve actually written a little package called RequiredKeywords.jl that implements this solution using a macro. You can use it like julia> using RequiredKeywords julia> @required_keywords f(x; y) = x*y f (generic function with 1 method) julia> f(2,y=2) 4 julia> f(2) ERROR: Unassigned Keyword: Re…

[image] mkborregaard: f(x) = println(x) Just a quick question. When we write function this way, how do we handle function if the code lines extend multiple lines, but not s single one? Thanks.

Make function arguments positional or keyword

General Usage

mkborregaard April 3, 2017, 3:20pm 29

I think I saw somewhere that

f(x) = begin
    y = x + x
    println(y)
end

was deprecated as recommended style in favour of

function f(x)
    y = x + x
    println(y)
end

so I thought only the really compact format was recommended?

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Make function arguments positional or keyword

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