Julia Language Metaprogramming Reimplementing the @show macro
Example
In Julia, the @show macro is often useful for debugging purposes. It displays both the expression to be evaluated and its result, finally returning the value of the result:
julia> @show 1 + 1
1 + 1 = 2
2
It is straightforward to create our own version of @show:
julia> macro myshow(expression)
quote
value = $expression
println($(Meta.quot(expression)), " = ", value)
value
end
end
To use the new version, simply use the @myshow macro:
julia> x = @myshow 1 + 1 1 + 1 = 2 2 julia> x 2
