5P P M T B O E 5F D I O J R V F T U I B U . B L F :P V . P S F $ S F B U J W F

!ZVLJ $PNNJUFS .BJOUBJOFSPGUIFkaminariHFN $SFBUPSPGUIFdid_you_meanHFN : 6 , * / * 4 ) * + * . "

require "did_you_mean" "Yuki".starts_with?("Y") # => NoMethodError: undefined method `starts_with?’ for … # Did you mean? start_with?

require "did_you_mean" "Yuki".starts_with?("Y") # => NoMethodError: undefined method `starts_with?’ for … # Did you mean? start_with? I S E E Y O U A R E T RY I N G T O C A L L A M E T H O D

!ZVLJ 4PGUXBSF&OHJOFFSBUɹ : 6 , * / * 4 ) * + * . "

5P P M T B O E 5F D I O J R V F T U I B U . B L F :P V . P S F $ S F B U J W F

$ gem i did_you_mean -v=1.0.2 require 'did_you_mean/experimental'

@full_name = "Yuki Nishijima" @full_anme.split(" ") # => NoMethodError: undefined method `split' for nil:NilClass 5ZQP Tip 1 / 20

require 'did_you_mean/experimental' @full_name = "Yuki Nishijima" @full_anme.split(" ") # => NoMethodError: undefined method `split' for nil:NilClass # Did you mean? @full_name Tip 1 / 20

hash = {"name" => "Yuki"} hash.fetch("anme") # KeyError: key not found: "anme" 5ZQP Tip 2 / 20

require 'did_you_mean/experimental' hash = {"name" => "Yuki"} hash.fetch("anme") # KeyError: key not found: "anme" # Did you mean? "name" Tip 2 / 20

class User def iniialize(name, ...) ... end end User.new("Yuki Nishijima", ...) # => ArgumentError: wrong number of arguments … 5ZQP Tip 3 / 20

require 'did_you_mean/experimental' class User def iniialize(name, ...) ... end end # => warning: iniialize might be misspelled, perhaps you meant initialize? User.new("Yuki Nishijima", ...) # => ArgumentError: wrong number of arguments … Tip 3 / 20

>= 1.8.0 bundler config jobs *OTUBMMTHFNTJOQBSBMMFMVTJOHUISFBET Tip 4 / 20

$ bundle config --global jobs 1 $ time bundle … Bundle complete! 96 Gemfile dependencies, 228 gems now installed. real 2m53.697s user 0m14.158s sys 0m4.141s $ 3 min ! >= 1.8.0 Tip 4 / 20

$ bundle config --global jobs 16 $ time bundle … Bundle complete! 96 Gemfile dependencies, 228 gems now installed. real 0m25.994s user 0m15.606s sys 0m6.555s $ 30 sec " >= 1.8.0 Tip 4 / 20

Make a request on railsconsole Tip 5 / 20

$ rails c Loading development environment (Rails 4.2.6) [1] pry(main)> app.get "/" Started GET "/" for 127.0.0.1 at 2016-06-12 22:19:21 +0000 Processing by ProductsController#index as HTML Product Load (1.0ms) SELECT "products".* FROM "products" LIMIT 25 OFFSET 0 Rendered products/index.html.haml within layouts/application (3.1ms) … Rendered shared/_head.html.haml (9.6ms) Rendered shared/_footer.html.haml (40.1ms) Completed 200 OK in 104ms (Views: 100.6ms | ActiveRecord: 1.0ms) => 200 [2] pry(main)> Tip 5 / 20

Power Assert Tip 6 / 20

hsbt/minitest-power_assert

power-assert-js/power-assert

watch &YFDVUFTBDPNNBOEQFSJPEJDBMMZ TIPXJOH PVUQVUGVMMTDSFFO Tip 7 / 20

Tip 13 / 20 &YBNQMF IUUQCJUMZSESDUPPMTXBUDI

git diff`TOFXDPNQBDUJPOIFVSJTUJD >= 2.9 Tip 8 / 20 git diff --compaction-heuristic git config --global diff.compactionHeuristic true PS

XJUI --compaction-heuristic XJUIPVU Tip 8 / 20 >= 2.9

#SBDF&YQBOTJPO Tip 9 / 20

$ mv path/to/old.rb path/to/new.rb $ mv path/to/{old,new}.rb # same as above $ cp path/to/org.rb path/to/new.rb $ cp path/to/{org,new}.rb # same as above Tip 9 / 20

history %JTQMBZTDPNNBOETZPVFYFDVUFE Tip 10 / 20

$ history 1039 git add ext/ 1040 gst 1041 git add . 1042 gst … 2029 git git git://git.git.git/git/git.git git 2030 more ~/.gitconfig 2031 more /etc/hosts 2032 gst 2033 cd ../did 2034 cd ../../did_you_mean 2035 gst 2036 history $ Tip 10 / 20

$ history 1039 git add ext/ 1040 gst 1041 git add . 1042 gst … 2029 git git git://git.git.git/git/git.git git 2030 more ~/.gitconfig 2031 more /etc/hosts 2032 gst 2033 cd ../did 2034 cd ../../did_you_mean 2035 gst 2036 history $ Tip 10 / 20

2034 cd ../../did_you_mean 2035 rake test test:experimental test:accuracy benchmark:memory 2036 history 2037 gst 2038 history vagrant@ubuntu-14:/GitHub/did_you_mean$ !2035 rake test test:experimental test:accuracy benchmark:memory /home/vagrant/.rbenv/versions/2.4.0-dev/bin/ruby -w -I"lib:test" -I"/home/ vagrant/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib" "/home/ vagrant/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib/rake/ rake_test_loader.rb" "test/core_ext/name_error_extension_test.rb" "test/edit_distance/ jaro_winkler_test.rb" "test/spell_checker_test.rb" "test/spell_checking/ class_name_test.rb" "test/spell_checking/method_name_test.rb" "test/spell_checking/ uncorrectable_name_test.rb" “test/spell_checking/variable_name_test.rb" … vagrant@ubuntu-14:/GitHub/did_you_mean$ Tip 11 / 20

!! &YFDVUFTUIFMBTUDPNNBOEUIBUXBTKVTUFYFDVUFE Tip 12 / 20

vagrant@ubuntu-14:/GitHub/did_you_mean$ !2035 rake test test:experimental test:accuracy benchmark:memory /home/vagrant/.rbenv/versions/2.4.0-dev/bin/ruby -w -I"lib:test" -I"/home/vagrant/.rbenv/ versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib" "/home/vagrant/.rbenv/versions/ 2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib/rake/rake_test_loader.rb" "test/core_ext/ name_error_extension_test.rb" "test/edit_distance/jaro_winkler_test.rb" "test/ spell_checker_test.rb" "test/spell_checking/class_name_test.rb" "test/spell_checking/ method_name_test.rb" "test/spell_checking/uncorrectable_name_test.rb" “test/spell_checking/ variable_name_test.rb" … vagrant@ubuntu-14:/GitHub/did_you_mean$ !! rake test test:experimental test:accuracy benchmark:memory /home/vagrant/.rbenv/versions/2.4.0-dev/bin/ruby -w -I"lib:test" -I"/home/vagrant/.rbenv/ versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib" "/home/vagrant/.rbenv/versions/ 2.4.0-dev/lib/ruby/gems/2.4.0/gems/rake-11.1.2/lib/rake/rake_test_loader.rb" "test/core_ext/ name_error_extension_test.rb" "test/edit_distance/jaro_winkler_test.rb" "test/ spell_checker_test.rb" "test/spell_checking/class_name_test.rb" "test/spell_checking/ method_name_test.rb" "test/spell_checking/uncorrectable_name_test.rb" “test/spell_checking/ variable_name_test.rb" … vagrant@ubuntu-14:/GitHub/did_you_mean$ Tip 12 / 20

ctrl + R 4FBSDIFTGPSBNBUDIJOHDPNNBOE QSFWJPVTMZUZQFEPOUFSNJOBM Tip 13 / 20

Tip 13 / 20 &YBNQMF IUUQCJUMZSESDUPPMTDUSM3

tree %JTQMBZTUIFEJSFDUPSZUSFF Tip 14 / 20

vagrant@ubuntu-14:/GitHub/did_you_mean$ tree lib/did_you_mean/spell_checkers/ lib/did_you_mean/spell_checkers/ |-- method_name_checker.rb |-- name_error_checkers | |-- class_name_checker.rb | `-- variable_name_checker.rb |-- name_error_checkers.rb `-- null_checker.rb 1 directory, 5 files vagrant@ubuntu-14:/GitHub/did_you_mean$ Tip 14 / 20

/GitHub/jruby$ tree -f core/src/ | grep RubyStruct | | |-- core/src/main/java/org/jruby/RubyStruct.java # == find core/src/ -name "*RubyStruct*" Tip 14 / 20

ag $PEFTFBSDIJOHUPPMTJNJMBSUPack CVUGBTUFS ggreer/the_silver_searcher Tip 15 / 20

/GitHub/did_you_mean$ ag literal lib/ lib/did_you_mean/experimental/initializer_name_correction.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/formatter.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/verbose_formatter.rb 1:# -*- frozen-string-literal: true -*- Tip 15 / 20

Tip 15 / 20 /GitHub/did_you_mean$ ag literal lib/ lib/did_you_mean/experimental/initializer_name_correction.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/formatter.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb 1:# -*- frozen-string-literal: true -*- lib/did_you_mean/verbose_formatter.rb 1:# -*- frozen-string-literal: true -*- Y G B T U F S U I B O a c k

HTTPie #FUUFScurl jkbrzt/httpie Tip 16 / 20

$ curl https://rubygems.org/api/v1/gems/did_you_mean.json {"name":"did_you_mean","downloads":284421,"version":"1.0.2","version_downloads": 2445,"platform":"ruby","authors":"Yuki Nishijima","info":"\"did you mean?\" experience in Ruby: the error message will tell you the right one when you misspelled something.","licenses":["MIT"],"metadata": {},"sha":"caa50332c6de39d5452f85f1efa9e9080d9073591edf7be8cb1b9b333a63fd6a","project_uri":"htt ps://rubygems.org/gems/did_you_mean","gem_uri":"https://rubygems.org/gems/ did_you_mean-1.0.2.gem","homepage_uri":"https://github.com/yuki24/ did_you_mean","wiki_uri":null,"documentation_uri":"http://www.rubydoc.info/gems/did_you_mean/ 1.0.2","mailing_list_uri":null,"source_code_uri":null,"bug_tracker_uri":null,"dependencies": {"development":[{"name":"bundler","requirements":"~\u003e 1.10"}, {"name":"minitest","requirements":"\u003e= 0"},{"name":"rake","requirements":"\u003e= 0"}],"runtime":[]}} Tip 16 / 20

Tip 16 / 20 $ http https://rubygems.org/api/v1/gems/did_you_mean.json HTTP/1.1 200 OK … { "authors": "Yuki Nishijima", "bug_tracker_uri": null, "dependencies": { … }, "documentation_uri": "http://www.rubydoc.info/gems/did_you_mean/1.0.2", "downloads": 284423, "gem_uri": "https://rubygems.org/gems/did_you_mean-1.0.2.gem", "homepage_uri": "https://github.com/yuki24/did_you_mean", "info": "\"did you mean?\" experience in Ruby …”, "licenses": [ "MIT" ], "mailing_list_uri": null, "metadata": {}, "name": "did_you_mean", "platform": “ruby", …

jq +40/GPSNBUUFS stedolan/jq Tip 17 / 20

$ curl https://rubygems.org/api/v1/gems/did_you_mean.json Tip 17 / 20

$ curl https://rubygems.org/api/v1/gems/did_you_mean.json | jq Tip 17 / 20

Tip 17 / 20 $ curl https://rubygems.org/api/v1/gems/did_you_mean.json | jq { "name": "did_you_mean", "downloads": 284426, "version": "1.0.2", "version_downloads": 2446, "platform": "ruby", "authors": "Yuki Nishijima", "info": "\"did you mean?\" experience in Ruby …”, "licenses": [ "MIT" ], "metadata": {}, "sha": "caa50332c6de39d5452f85f1efa9e9080d9073591edf7be8cb1b9b333a63fd6a", "project_uri": "https://rubygems.org/gems/did_you_mean", "gem_uri": "https://rubygems.org/gems/did_you_mean-1.0.2.gem", "homepage_uri": "https://github.com/yuki24/did_you_mean", "wiki_uri": null, "documentation_uri": "http://www.rubydoc.info/gems/did_you_mean/1.0.2", …

Tip 17 / 20 $ curl https://rubygems.org/api/v1/gems/did_you_mean.json | jq .dependencies.development

Tip 17 / 20 $ curl https://rubygems.org/api/v1/gems/did_you_mean.json | jq .dependencies.development [ { "name": "bundler", "requirements": "~> 1.10" }, { "name": "minitest", "requirements": ">= 0" }, { "name": "rake", "requirements": ">= 0" } ]

pygmentize 4ZOUBYIJHIMJHIUFSXSJUUFOJO1ZUIPO Tip 18 / 20

more Tip 18 / 20

pygmentize Tip 18 / 20

alias more=‘pygmentize -g’ Tip 18 / 20

more! Tip 18 / 20

Tip 19 / 20

ShiftIt fikovnik/ShiftIt Tip 20 / 20

Tip 13 / 20 &YBNQMF IUUQCJUMZSESDUPPMT4IJGU*U

w OVNCFS w w $USM3 w USFF w BH UIFTJMWFSTFBSDIFS w )551JF w KR w QZHNFOUJ[F w IUUQXXXFYQMBJOTIFMMDPN w 4IJGU*U w *OTUBODFWBSJBCMFDPSSFDUJPO w *OJUJBMJ[FSOBNFDPSSFDUJPO w ,FZ&SSPSOBNFDPSSFDUJPO w CVOEMFDPOpHHMPCBMKPCT/ w .BLFBSFRVFTUPOSBJMTDPOTPMF w 1PXFSBTTFSU w XBUDI w (JUEJGG w #SBDF&YQBOTJPO w IJTUPSZ

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