How to go about removing the last element? For example, I have strings like these: str1 = "My testing String" str2 = "My another testing string" I need a neat way of showing the output: str1 = "My testing" str2 = "My another testing" This is what I could do: str1 = str1.split(" ") str1.delete(str1.last) str1.join(" ") # => "My testing" I was won…

removing last word from a sentence (a string)

#!/usr/bin/ruby
require 'benchmark'
str2 = "My another testing well string"
n = 500
Benchmark.bm(40) do |x|
  x.report("str2[/(.*)\s/,1]                  "){ n.times { str2[/(.*)\s/,1] } }
  x.report("str2[0...str2.rindex(' ')]        "){ n.times { str2[0...str2.rindex(' ')] } }
  x.report("str2.split(' ')[0...-1].join(' ') "){ n.times { str2.split(' ')[0...-1].join(' ') } }
  x.report("str2[/.*(?=\s)/]                  "){ n.times { str2[/.*(?=\s)/] } }
end

                                             user     system      total        real
str2[/(.*) /,1]                            0.000000   0.000000   0.000000 (  0.001481)
str2[0...str2.rindex(' ')]                 0.010000   0.000000   0.010000 (  0.000993)
str2.split(' ')[0...-1].join(' ')          0.000000   0.000000   0.000000 (  0.002894)
str2[/.*(?= )/]                            0.000000   0.000000   0.000000 (  0.001523)

Benchmark.bmbm(40) do |x|
  x.report("str2[/(.*)\s/,1]                  "){ n.times { str2[/(.*)\s/,1] } }
  x.report("str2[0...str2.rindex(' ')]        "){ n.times { str2[0...str2.rindex(' ')] } }
  x.report("str2.split(' ')[0...-1].join(' ') "){ n.times { str2.split(' ')[0...-1].join(' ') } }
  x.report("str2[/.*(?=\s)/]                  "){ n.times { str2[/.*(?=\s)/] } }
end

Rehearsal ----------------------------------------------------------------------------
str2[/(.*) /,1]                            0.000000   0.000000   0.000000 (  0.001482)
str2[0...str2.rindex(' ')]                 0.000000   0.000000   0.000000 (  0.000918)
str2.split(' ')[0...-1].join(' ')          0.010000   0.000000   0.010000 (  0.002903)
str2[/.*(?= )/]                            0.000000   0.000000   0.000000 (  0.001482)
------------------------------------------------------------------- total: 0.010000sec

                                               user     system      total        real
str2[/(.*) /,1]                            0.000000   0.000000   0.000000 (  0.000520)
str2[0...str2.rindex(' ')]                 0.000000   0.000000   0.000000 (  0.000399)
str2.split(' ')[0...-1].join(' ')          0.000000   0.000000   0.000000 (  0.001108)
str2[/.*(?= )/]                            0.000000   0.000000   0.000000 (  0.000511)