Functional Programming - Sum

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The addition (sum) function in a Functional programming context

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Snippet

Java

Stream

• From a collection of object that return an exit status

Integer errors = insertStreamListeners
                .stream()
                .mapToInt(s -> s.getExitStatus()>0?1:0)
                .sum();

• Where myMao is map where the values are integers

Integer tot = myMap
    .values()
    .stream()
    .mapToInt(s->s)
    .sum()