ruby - 为什么此.each块不返回与.select相同的内容？

从codequizzes 6：从captain planet数组创建一个包含字母“a”的所有元素的新数组。

captain_planet = ["earth", "fire", "wind", "water", "heart"]

我理解他们的回答：

captain_planet.select do |word|
  word.include?("a")
end

但是，我似乎不明白为什么这不返回相同的东西：

ret = []

captain_planet.each do |x|
    if x.include?('a')
        ret.push(x)
    end
end

思想？

最佳答案

尝试在块结束后查看ret的输出。

2.0.0p247 :001 > ret = []
 => []
2.0.0p247 :002 > captain_planet = ["earth", "fire", "wind", "water", "heart"]
 => ["earth", "fire", "wind", "water", "heart"]
2.0.0p247 :003 > captain_planet.each do |x|
2.0.0p247 :004 >         if x.include?('a')
2.0.0p247 :005?>             ret.push(x)
2.0.0p247 :006?>         end
2.0.0p247 :007?>   end
 => ["earth", "fire", "wind", "water", "heart"]
2.0.0p247 :008 > puts ret
earth
water
heart
 => nil

关于ruby - 为什么此.each块不返回与.select相同的内容？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/21323934/