Editing Multiple dispatch (section)

==== Julia ====
[[Julia (programming language)|Julia]] has built-in multiple dispatch, and it is central to the language design.<ref name=julia-review>{{cite journal |last1=Bezanson |first1=Jeff |last2=Edelman |first2=Alan |last3=Karpinski |first3=Stefan |last4=Shah |first4=Viral B. |title=Julia: A fresh approach to numerical computing |journal=SIAM Review |volume=59 |issue=1 |pages=65–98 |date=7 February 2017 |doi=10.1137/141000671 |arxiv=1411.1607|s2cid=13026838 }}</ref>  The Julia version of the example above might look like:

<syntaxhighlight lang="julia">
abstract type SpaceObject end

struct Asteroid <: SpaceObject
    size::Int    
end
struct Spaceship <: SpaceObject
    size::Int                  
end

collide_with(::Asteroid, ::Spaceship) = "a/s"
collide_with(::Spaceship, ::Asteroid) = "s/a"
collide_with(::Spaceship, ::Spaceship) = "s/s"
collide_with(::Asteroid, ::Asteroid) = "a/a"

collide(x::SpaceObject, y::SpaceObject) = (x.size > 100 && y.size > 100) ? "Big boom!" : collide_with(x, y)
</syntaxhighlight>

Output:
<syntaxhighlight lang="julia-repl">
julia> collide(Asteroid(101), Spaceship(300))
"Big boom!"

julia> collide(Asteroid(10), Spaceship(10))
"a/s"

julia> collide(Spaceship(101), Spaceship(10))
"s/s"
</syntaxhighlight>