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public ruby v1 · immutableclass Array def inject(n) each { |value| n = yield(n, value) } n end def sum inject(0) { |n, value| n + value } end def product inject(1) { |n, value| n * value } endendclass Array def inject(n) each { |value| n = yield(n, value) } n end def sum inject(0) { |n, value| n + value } end def product inject(1) { |n, value| n * value } endend