ARRAY.reject! { |c| c.empty? } vs ARRAY.reject!(&:empty?)

gistfile1.rb

require 'benchmark'

N = 10000

ARRAY = begin
  [].tap do |array|
    (1..1000).to_a.each do |entry|
      array << '' if rand(5) == 0
      array << entry.to_s
    end
  end
end

EMPTY_STRING = ''

Benchmark.bmbm do |x|
  
  x.report(".reject!(&:empty?)") { N.times {
    ARRAY.reject(&:empty?) 
  } }

  x.report("entry == ''") { N.times {
    ARRAY.reject { |entry| entry == EMPTY_STRING }
  } }

  x.report("|c| c.empty?") { N.times {
    ARRAY.reject  { |c| c.empty? }
  } }

end

#                          user     system      total        real
# .reject!(&:empty?)   0.960000   0.010000   0.970000 (  1.205196)
# entry == ''          1.370000   0.000000   1.370000 (  1.523413)
# |c| c.empty?         1.600000   0.010000   1.610000 (  1.820435)