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data = [’1′, ‘2′, ‘3′] s = ‘ ‘ data.each { |x| s << x << ‘ and a ‘ } s # => “1 and a 2 and a 3 and a” data.join(’ and a ‘) # => “1 and a 2 and a 3″ 我们自己也可以模拟Array#join的效果: s = “” data.each_with_index { |x,i| s << x; s << ” and a ” if i < data.length - 1 } s # => “1 and a 2 and a 3″