Ruby: How to iterate over a range, but in set increments?

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长发绾君心
长发绾君心 2020-12-07 09:52

So I\'m iterating over a range like so:

(1..100).each do |n|
    # n = 1
    # n = 2
    # n = 3
    # n = 4
    # n = 5
end

But what I\'d

4条回答
  •  猫巷女王i
    2020-12-07 10:39

    rng.step(n=1) {| obj | block } => rng
    

    Iterates over rng, passing each nth element to the block. If the range contains numbers or strings, natural ordering is used. Otherwise step invokes succ to iterate through range elements. The following code uses class Xs, which is defined in the class-level documentation.

    range = Xs.new(1)..Xs.new(10)
    range.step(2) {|x| puts x}
    range.step(3) {|x| puts x}
    

    produces:

    1 x
    3 xxx
    5 xxxxx
    7 xxxxxxx
    9 xxxxxxxxx
    1 x
    4 xxxx
    7 xxxxxxx
    10 xxxxxxxxxx
    

    Reference: http://ruby-doc.org/core/classes/Range.html

    ......

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