[email protected]:~$ irb 2.4.1 :001 > arr =[1,-1,2,3,-4] => [1, -1, 2, 3, -4] 2.4.1 :002 > arr.each{|e|p e} 1 -1 2 3 -4 => [1, -1, 2, 3, -4] 2.4.1 :003 > arr.reverse_each {|e| p e} -4 3 2 -1 1 => [1, -1, 2, 3, -4] 2.4.1 :004 > arr.each_with_index{ |e,i| p [e,i]} [1, 0] [-1, 1] [2, 2] [3, 3] [-4, 4] => [1, -1, 2, 3, -4] 2.4.1 :005 > arr.sort => [-4, -1, 1, 2, 3] 2.4.1 :006 > arr => [1, -1, 2, 3, -4] 2.4.1 :007 > arr.sort! => [-4, -1, 1, 2, 3] 2.4.1 :008 > arr => [-4, -1, 1, 2, 3] 2.4.1 :009 > arr.select{|e|e>0} => [1, 2, 3] 2.4.1 :010 > arr<< nil => [-4, -1, 1, 2, 3, nil] 2.4.1 :011 > arr.compact => [-4, -1, 1, 2, 3] 2.4.1 :012 > arr => [-4, -1, 1, 2, 3, nil] 2.4.1 :013 > arr.compact! => [-4, -1, 1, 2, 3] 2.4.1 :014 > arr => [-4, -1, 1, 2, 3] 2.4.1 :015 > arr.compact! => nil 2.4.1 :016 > arr => [-4, -1, 1, 2, 3] 2.4.1 :017 > arr.any?{|e|e<)} SyntaxError: (irb):17: syntax error, unexpected ‘)‘ arr.any?{|e|e<)} ^ from /home/soyo/.rvm/rubies/ruby-2.4.1/bin/irb:11:in `<main>‘ 2.4.1 :018 > arr.any?{|e|e<0} => true 2.4.1 :019 > arr.any?{|e| e>0} => true 2.4.1 :020 > arr.any?{|e| e>8} => false 2.4.1 :021 >
时间: 2024-10-12 20:49:50