Julia: Piping operator |> with multiple arguments
I am trying to pass multiple arguments to the built-in pipeline operator in Julia |>
.
I would like something like this:
join([randstring() for i in 1:100], " ")
However, using the pipeline operator, I get the error instead:
[randstring() for i in 1:100] |> join(" ")
I'm pretty sure this is a multiple dispatch feature with a connection, having its own method with delim
in the method join(strings, delim, [last])
that is defined as delim=""
when skipped.
Am I getting it right? Is there work around?
For what is worth most of my pipeline applications ends up taking more than one argument. For example:
[randstring() for i in 1:100] |> join(" ") |> replace("|", " ")
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The pipeline operator does nothing magical. It just takes the values on the left and applies them to the functions on the right. As you've found, join(" ")
doesn't return a function. In general, partial function applications in Julia do not return functions - this will mean something else (via multiple dispatch) or it will be a bug.
There are several options that allow you to support this:
-
Explicitly creating anonymous functions:
[randstring() for i in 1:100] |> x->join(x, " ") |> x->replace(x, "|", " ")
-
Use macros to enable the special magic you are looking for. There are several packages that support this.
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