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I read https://github.com/JuliaLang/julia/issues/5571 which made me think I could break lines like that due to some of the comments:
a = [x*5 for x in 0:20 if x>4]
scale(y) = (x)-> y*x
filter(y) = x -> [z for z in x if z>y]
a|>(x->x/3)
|>scale(2)
|>filter(4)
|>println
But I get the error:
ERROR: LoadError: syntax: "|>" is not a unary operator
in include_from_node1(::String) at ./loading.jl:488
in process_options(::Base.JLOptions) at ./client.jl:265
in _start() at ./client.jl:321
Am I forced to use a|>(x->x/3)|>scale(2)|>filter(4)|>println?
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The feature of Julia that allows the call of the right implementation of a function based on arguments is called multiple dispatch, and the implementations are referred to as methods. Each function may have a number of methods defined for various data types, and it may have no methods at all defined for some.
The map() is an inbuilt function in julia which is used to transform the specified collection by using specified operation to each element.
Julia defines corresponding dot operations for every binary operator. These are designed to work element-wise with collections of values (called vectorized). That is, the operator that is dotted is applied for each element of the collection.
You can move the |> operators to the line-ends:
julia> a|>(x->x/3)|>
scale(2)|>
filter(4)|>
println
This syntax is because the parser needs to decide unambiguously when a statement ends.
(actually, I've asked a question about such an issue myself and got a good answer. see Why is `where` syntax in Julia sensitive to new-line?)
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