which(io, f, args)

[WestleyArgentum]

I'm in a situation where I can't get output from which. It seems like it should accept an IO parameter instead of just printing to STDOUT.

To be honest, I'd also really like to see it return a reference to the function that would be called.

[StefanKarpinski]

See also #5464.

[JeffBezanson]

Yes, there is no reason for these to just print stuff. The underlying function methods returns an array of Method objects, whose display is basically equally useful. So all of these things might as well return useful values.

[WestleyArgentum]

Wow, timely. It sounds like #5464 is the way to go then!

[stevengj]

Note that #5464 did not change the return type of which; it still prints the method (albeit by using display).

It would be pretty easy to change whicht to return d instead of display(d) (util.jl:97), however. This would still display the result, and would do what you want.

(Not sure what it should return if nothing is found. nothing? That is not type-stable, but maybe that's not important for which.)