bench.rb

ready "codepoints" do
  before do
    @str = "a" * 30 + "x"
  end

  go "index many matches" do
    index = @str.index("a")
    while index
      index = @str.index("a", index + 1)
    end
  end

  go "codepoints many matches" do
    points = @str.codepoints
    i = 0
    length = points.length
    while i < length
      points[i] == 97
      i += 1
    end
  end

  go "index one match" do
    index = @str.index("x")
    while index
      index = @str.index("x", index + 1)
    end
  end

  go "codepoints one match" do
    points = @str.codepoints
    i = 0
    length = points.length
    while i < length
      points[i] == 120
      i += 1
    end
  end
end

gistfile1.txt

codepoints index many matches
  Baseline: |                                                           X------|
  Current:  |                                                           X------|
            0                                                           4.969 us

codepoints codepoints many matches
  Baseline: |                                                     X----------  |
  Current:  |                                                         X--------|
            0                                                           1.837 us

codepoints index one match
  Baseline: |                                                     X------------|
  Current:  |                                                     X--------    |
            0                                                         337.891 ns

codepoints codepoints one match
  Baseline: |                                                              X---|
  Current:  |                                                             X----|
            0                                                           1.708 us