Do we really need begin and end in the expression?

[pdeffebach]

In Lazy's @> you can do

@> rand(2, 3) DataFrame(:auto)

But in Chain you need

julia> @chain rand(2, 3) DataFrame(:auto)
ERROR: LoadError: Second argument of @chain must be a begin / end block
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] rewrite_chain_block(::Expr, ::Expr) at /home/peterwd/.julia/packages/Chain/HuSPl/src/Chain.jl:66
 [3] @chain(::LineNumberNode, ::Module, ::Any, ::Expr) at /home/peterwd/.julia/packages/Chain/HuSPl/src/Chain.jl:113
in expression starting at REPL[22]:1

Is there a technical reason for this? Maybe it's not necessary?

[jkrumbiegel]

It's not "technical" as much as I just didn't implement that syntax because I assumed data wrangling would never happen on a single line, if a chaining macro is used already to reduce the complexity. But maybe I'm wrong :) we could easily add this, someone else already made an issue about this earlier

[adkabo]

@chain begin
    1
    -
end

and

@chain 1 begin
    -
end

Seems like the begin might not be doing much here. Is there a case where the begin can't just be inferred automatically?

[jkrumbiegel]

Those two syntax alternatives are both explicitly implemented. The begin block is necessary to bundle the expressions on different lines. You can't do that with parentheses alone, that doesn't parse.

[pdeffebach]

Closed in #24