ruby：optimize => phrase.split(delimiter).collect {| p

phrase.split(delimiter).collect(&:strip)

但我认为你想要优化速度.我不知道为什么其他人在猜测.找出更快速的方法的唯一方法是对代码进行基准测试.

确保调整基准参数 – 这只是一个例子.

require "benchmark"

# Adjust parameters below for your typical use case.
n = 10_000
input = " This is - an example. - A relatively long string " +
  "- delimited by dashes. - Adjust if necessary " * 100
delimiter = "-"

Benchmark.bmbm do |bench|
  bench.report "collect { |s| s.lstrip.rstrip }" do
    # Your example.
    n.times { input.split(delimiter).collect { |s| s.lstrip.rstrip } }
  end

  bench.report "collect { |s| s.strip }" do
    # Use .strip instead of .lstrip.rstrip.
    n.times { input.split(delimiter).collect { |s| s.strip } }
  end

  bench.report "collect { |s| s.strip! }" do
    # Use .strip! to modifiy strings in-place.
    n.times { input.split(delimiter).collect { |s| s.strip! } }
  end

  bench.report "collect(&:strip!)" do
    # Slow block creation (&:strip! syntax).
    n.times { input.split(delimiter).collect(&:strip!) }
  end

  bench.report "split(/s*#{delim}s*/) (static)" do
    # Use static regex -- only possible if delimiter doesn't change.
    re = Regexp.new("s*#{delimiter}s*")
    n.times { input.split(re) }
  end

  bench.report "split(/s*#{delim}s*/) (dynamic)" do
    # Use dynamic regex,slower to create every time?
    n.times { input.split(Regexp.new("s*#{delimiter}s*")) }
  end
end

我的笔记本电脑上的结果与上面列出的参数：

user     system      total        real
collect { |s| s.lstrip.rstrip }   7.970000   0.050000   8.020000 (  8.246598)
collect { |s| s.strip }           6.350000   0.050000   6.400000 (  6.837892)
collect { |s| s.strip! }          5.110000   0.020000   5.130000 (  5.148050)
collect(&:strip!)                 5.700000   0.030000   5.730000 (  6.010845)
split(/s*#{delim}s*/) (static)  6.890000   0.030000   6.920000 (  7.071058)
split(/s*#{delim}s*/) (dynamic) 6.900000   0.020000   6.920000 (  6.983142)

从上面我可以得出结论：

>使用strip而不是.lstrip.rstrip更快.
>首选&amp ;:剥离！超过{| s | s.strip！带来了性能成本.
>简单的正则表达式模式几乎与使用分割条带一样快.

我能想到的事情可能会影响结果：

>分隔符的长度(以及是否为空格).
>要分割的字符串的长度.
>字符串中可拆分块的长度.

但是不要相信我的话.测量它！