将长固定数转换为数组 Ruby [英] Turning long fixed number to array Ruby

问题描述

ruby 有没有办法把74239 这样的fixnum 变成[7,4,2,3,9] 这样的数组?

Is there a method in ruby to turn fixnum like 74239 into an array like [7,4,2,3,9]?

推荐答案

你不需要为这种事情来回走一趟:

You don't need to take a round trip through string-land for this sort of thing:

def digits(n)
  Math.log10(n).floor.downto(0).map { |i| (n / 10**i) % 10 }
end

ary = digits(74239)
# [7, 4, 2, 3, 9]

这确实假设 n 当然是正数，如果需要，将 n = n.abs 放入混合中可以解决这个问题.如果您需要覆盖非正值，则:

This does assume that n is positive of course, slipping an n = n.abs into the mix can take care of that if needed. If you need to cover non-positive values, then:

def digits(n)
  return [0] if(n == 0)
  if(n < 0)
    neg = true
    n   = n.abs
  end
  a = Math.log10(n).floor.downto(0).map { |i| (n / 10**i) % 10 }
  a[0] *= -1 if(neg)
  a
end

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