{"id":5171,"date":"2022-08-27T01:42:39","date_gmt":"2022-08-26T20:12:39","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-insert-code-into-the-beginning-of-each-method-of-a-class\/"},"modified":"2022-08-27T01:42:39","modified_gmt":"2022-08-26T20:12:39","slug":"solved-insert-code-into-the-beginning-of-each-method-of-a-class","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-insert-code-into-the-beginning-of-each-method-of-a-class\/","title":{"rendered":"[Solved] Insert code into the beginning of each method of a class"},"content":{"rendered":"

[ad_1]
\n<\/p>\n

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\n

I initially misinterpreted the question (but have left my original answer after the horizontal line below). I believe the following may be what you are looking for.<\/p>\n

class C1\n  [:m1, :m2].each do |m|\n    define_method(m) do |name|\n      @i_am = __method__\n      puts \"I'm #{name} from method #{@i_am}\"\n    end\n  end\nend\n\nC1.instance_methods(false)\n  #=> [:m1, :m2] \nc1 = C1.new\n  #=> #<C1:0x007f94a10c0b60> \nc1.m1 \"Bob\"\n  # I'm Bob from method m1\nc1.m2 \"Lucy\"\n  # I'm Lucy from method m2\n<\/code><\/pre>\n
\n
My original solution follows.<\/p>\n
class C1\n  def add_code_to_beginning(meth)\n    meth = meth.to_sym\n    self.class.send(:alias_method, \"old_#{meth}\".to_sym, meth)\n    self.class.send(:define_method, meth) do\n      yield\n      send(\"old_#{meth}\".to_sym)\n    end\n  end\nend\n<\/code><\/pre>\n
Module#alias_method<\/a>
\nand Module#define_method<\/a> are private; hence the need to use send<\/code>.<\/p>\n
c = C1.new\n  #=> #<C1:0x007ff5e3023650> \nC1.instance_methods(false)\n  #=> [:m1, :m2, :add_code_to_beginning] \n\nc.add_code_to_beginning(:m1) do\n  puts \"hiya\"\nend\n\nC1.instance_methods(false)\n  #=> [:m1, :m2, :add_code_to_beginning, :old_m1] \nc.m1\n  # hiya\n  #=> :m1 \n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            4<\/span> <\/p><\/div>\n<\/div>\n
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solved Insert code into the beginning of each method of a class <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] I initially misinterpreted the question (but have left my original answer after the horizontal line below). I believe the following may be what you are looking for. class C1 [:m1, :m2].each do |m| define_method(m) do |name| @i_am = __method__ puts “I’m #{name} from method #{@i_am}” end end end C1.instance_methods(false) #=> [:m1, :m2] c1 = … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[1261,455],"class_list":["post-5171","post","type-post","status-publish","format-standard","hentry","category-solved","tag-metaprogramming","tag-ruby"],"yoast_head":"\n[Solved] Insert code into the beginning of each method of a class - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-insert-code-into-the-beginning-of-each-method-of-a-class\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Insert code into the beginning of each method of a class - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I initially misinterpreted the question (but have left my original answer after the horizontal line below). I believe the following may be what you are looking for. class C1 [:m1, :m2].each do |m| define_method(m) do |name| @i_am = __method__ puts "I'm #{name} from method #{@i_am}" end end end C1.instance_methods(false) #=> [:m1, :m2] c1 = ... 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I believe the following may be what you are looking for. class C1 [:m1, :m2].each do |m| define_method(m) do |name| @i_am = __method__ puts \"I'm #{name} from method #{@i_am}\" end end end C1.instance_methods(false) #=> [:m1, :m2] c1 = ... 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