过滤以从数组中排除元素 [英] Filter to exclude elements from array

问题描述

尝试过滤数组中的某些条目.无法保证它们在主阵列中，因此我正在通过迭代进行测试.

Trying to filter some entries from an array. It's not guaranteed they are in the master array, so I'm testing through an iteration.

total = ['alpha', 'bravo', 'charlie', 'delta', 'echo']
hide = ['charlie', 'echo']

pick = []
for i in total
  if !hide.include?(i)
    puts i
    pick.push(i)
  end
end
puts pick

这不起作用.有没有更好的方法来提供这种过滤器?

This isn't working. Is there a better way of providing this kind of filter?

推荐答案

Ruby使您可以在两个数组上使用公共实例方法来获取它们的相交或互斥元素:

Ruby lets you use public instance methods on two arrays to get their intersecting or exclusive elements:

a1 = ['alpha', 'bravo', 'charlie', 'delta', 'echo']
a2  = ['charlie', 'echo']
puts a1 - a2
=>  ['alpha', 'bravo', 'delta']

puts a1 & a2
=>  ['charlie', 'echo']

有关更多信息，请检查 ruby​​doc阵列.您很可能会在那里找到所需的东西.

For more information check rubydoc Array. It's likely that you'll find exactly what you need there.

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