如何从Ruby中的数组中获取第1，第2和第5个元素？

Question

How should I get the 1st, 2nd and 5th element from an array? Is there a very easy way to do it?

Answer 1

这可以通过Array＃values_at完成 ：

p ['a','b','c','d','e'].values_at(0,1,4) #=> ["a", "b", "e"]

Answer 2

Pretty much the same as every other language.

irb(main):001:0> array = ['blue', 'red', 'green', 'orange', 'purple']
=> ["blue", "red", "green", "orange", "purple"]
irb(main):002:0> array[0]
=> "blue"
irb(main):003:0> array[1] 
=> "red"
irb(main):004:0> array[4]
=> "purple"

Next time check the official documentation: http://www.ruby-doc.org/core-1.9.3/Array.html .