Genetic Algorithms in Elixir: Use the capture operator fully

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Hi there! Not sure if this is the best thread for this, and it’s also very minor and a matter of personal preference :slightly_smiling_face:

The code:

|> Enum.sort_by(fitness_function, &>=/2)

is used a handful of times throughout the book. I find it a bit clearer to use:

|> Enum.sort_by(fitness_function, :desc)

but again, purely personal preference :smile:

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