selection.jl

using Match
function roulette(popsize::Int64, n_parents::Int64, population::Vector{Chromosome})::Vector{Int64}
    evaluations::Vector{Float64} = [fitness(x) for x in population]
    evaluations = evaluations ./ sum(evaluations)
    return sample(1:popsize, Weights(vec(evaluations)), n_parents)
end
function select(popsize::Int64, n_parents::Int64, population::Vector{Chromosome}; method::String="random")::Vector{Int64}
    @match method begin
        "random" => randperm(popsize)[1:n_parents]
        "roulette" => roulette(popsize, n_parents, population)
        _ => randperm(popsize)[1:n_parents]
    end
end