Hi,
This is an interesting syntax indeed. Thanks!
Jan
Dňa streda, 21. októbra 2015 18:04:47 UTC+2 Ben Arthur napísal(-a):
>
> element-wise multiplication of string vectors works too, but only if one
> vector is of length 1:
>
> julia> @time ["["] .* ["as", "sdf", "qwer"] .* ["]"]
> 0.000033 seconds (35 allocations: 1.656 KB)
> 3-element Array{ASCIIString,1}:
> "[as]"
> "[sdf]"
> "[qwer]"
>
> if you prefer this syntax to map or comprehension, extending .* as follows
> uses less memory:
>
> julia> import Base.(.*)
>
> julia> (.*){T<:AbstractString}(v::Vector{T},s::T) = [i*s for i in v]
> .* (generic function with 36 methods)
>
> julia> (.*){T<:AbstractString}(s::T,v::Vector{T}) = [s*i for i in v]
> .* (generic function with 37 methods)
>
> julia> @time "[" .* ["as", "sdf", "qwer"] .* "]"
> 0.000010 seconds (19 allocations: 1024 bytes)
> 3-element Array{ASCIIString,1}:
> "[as]"
> "[sdf]"
> "[qwer]"
>
> see https://github.com/JuliaLang/julia/issues/13053
>
