Ruby each_with_index偏移量 [英] Ruby each_with_index offset
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问题描述
我可以在each_with_index循环迭代器中定义索引的偏移量吗?
我的直接尝试失败:
Can I define the offset of the index in the each_with_index loop iterator? My straight forward attempt failed:
some_array.each_with_index{|item, index = 1| some_func(item, index) }
编辑:
澄清:我不想要数组偏移我希望each_with_index中的索引不是从0开始但是例如1。
Clarification: I don't want an array offset I want that the index within the each_with_index doesn't start from 0 but e.g. 1.
推荐答案
实际上, 枚举器#with_index
接收偏移作为可选参数:
Actually, Enumerator#with_index
receives offset as an optional parameter:
[:foo, :bar, :baz].to_enum.with_index(1).each do |elem, i|
puts "#{i}: #{elem}"
end
输出:
1: foo
2: bar
3: baz
BTW,我认为它只存在于1.9.2。
BTW, I think it is there only in 1.9.2.
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