计算数组数组中的元素

Question

element = [["BLUE", "CAT", "BEAR"], ["BALL", "CHAIR", "BOW"], ["CLOWN", "COLA", "PARROT", "LOVE"]]

阵列中显然有十个元素。如何在不展平阵列的情况下找到计数？

Answer 1

使用Ruby 2.4，

element.sum(&:size) #=> 10

Answer 2

ary = [["BLUE", "CAT", "BEAR"], ["BALL", "CHAIR", "BOW"], ["CLOWN", "COLA", "PARROT", "LOVE"]]

sum = ary.inject(0) { |tot, e| tot + e.size }

 => 10

Answer 3

ary.map(&:count).inject(:+)
#⇒ 10