通过ruby数组迭代迭代

Question

我如何迭代ruby数组并始终获得两个值,当前和下一个,如:

[1,2,3,4,5,6].pairwise do |a,b|
  # a=1, b=2 in first iteration
  # a=2, b=3 in second iteration
  # a=3, b=4 in third iteration
  # ...
  # a=5, b=6 in last iteration
end

我的用例:我想测试数组是否已排序,并且通过使用这样的迭代器,我总能比较两个值.

我不是each_slice在这个问题中寻找:将ruby数组转换为连续对的数组

Answer 1

您正在寻找each_cons:

(1..6).each_cons(2) { |a, b| p a: a, b: b }
# {:a=>1, :b=>2}
# {:a=>2, :b=>3}
# {:a=>3, :b=>4}
# {:a=>4, :b=>5}
# {:a=>5, :b=>6}