Ruby 将数组转换为 Fixnum [英] Ruby convert Array to Fixnum

问题描述

我在研究它时没有找到任何相关的东西.我基本上是在尝试将数组(例如 [5, 1, 7 ,8] )转换为具有 5178 值的 fixnum.

I failed to find anything relevant when I was researching it. I am bascially trying to convert an array, for example [5, 1, 7 ,8] to a fixnum which will have the value of 5178.

推荐答案

[5, 1, 7 ,8].inject{|n, d| n * 10 + d}
# => 5178

对比

t = Time.now
100000.times do
  [5, 1, 7 ,8].inject{|n, d| n * 10 + d}
end
Time.now - t # => 0.108719628

t = Time.now
100000.times do
  [5, 1, 7, 8].join.to_i
end
Time.now - t # => 0.246565502

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