25 lines
995 B
Julia
25 lines
995 B
Julia
fitness(a::AbstractString, b::AbstractString) = count(l == t for (l, t) in zip(a, b))
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function mutate(str::AbstractString, rate::Float64)
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L = collect(Char, " ABCDEFGHIJKLMNOPQRSTUVWXYZ")
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return map(str) do c
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if rand() < rate rand(L) else c end
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end
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end
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function evolve(parent::String, target::String, mutrate::Float64, nchild::Int)
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println("Initial parent is $parent, its fitness is $(fitness(parent, target))")
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gens = 0
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while parent != target
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children = collect(mutate(parent, mutrate) for i in 1:nchild)
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bestfit, best = findmax(fitness.(children, target))
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parent = children[best]
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gens += 1
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if gens % 10 == 0
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println("After $gens generations, the new parent is $parent and its fitness is $(fitness(parent, target))")
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end
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end
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println("After $gens generations, the parent evolved into the target $target")
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end
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evolve("IU RFSGJABGOLYWF XSMFXNIABKT", "METHINKS IT IS LIKE A WEASEL", 0.08998, 100)
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