Frozenrails2011

@josephwilkTuesday, 20 September 11

Joseph WilkTuesday, 20 September 11

Limited Red Joseph WilkTuesday, 20 September 11

Limited Red Oh crap Joseph WilkTuesday, 20 September 11

Work In ProgressTuesday, 20 September 11

Context Switching is ExpensiveTuesday, 20 September 11

Small Batch sizes Large batches Small batchesTuesday, 20 September 11

Red == Work in ProgressTuesday, 20 September 11

1 day 1.5 day 2 dayTuesday, 20 September 11

Why is Red Bad?Tuesday, 20 September 11

Limit Red Measure Red Visualise Red LearnTuesday, 20 September 11

Are we Professionals?Tuesday, 20 September 11

Tuesday, 20 September 11

Joseph Wilk PAIRING RED TIME TESTING REFACTORINGTuesday, 20 September 11

Measuring & Visualising RedTuesday, 20 September 11

Limited Red Learn and adapt from test metricsTuesday, 20 September 11

Industrial LogicTuesday, 20 September 11

Fighting RedTuesday, 20 September 11

Patterns ‣Parallel Change ‣Narrowed Change ‣Sequence Change ‣Graceful Retreat ‣Piecemeal Change ‣Gradual Change ‣Evolved Target ‣Unified Methods Joshua KerievskyTuesday, 20 September 11

Parallel Change class ImageResizer def resize(x,y) ... end endTuesday, 20 September 11

Parallel Change class ImageResizer include ThumbResizer end module ThumbResizer def resize(x,y) ... end endTuesday, 20 September 11

Ship itTuesday, 20 September 11

But....Tuesday, 20 September 11

class ImageResizer Parallel Change if FeatureFlipper.active?(:fast_resizer) include FastThumbResizer else include ThumbResizer end end module ThumbResizer def resize(x,y) ... end end module FastThumbResizer def resize(x,y) ... end endTuesday, 20 September 11

But.. Both versions!!!Tuesday, 20 September 11

Parallel Change class ImageResizer include FastThumbResizer end module FastThumbResizer def resize(x,y) ... end endTuesday, 20 September 11

Narrowed Change <%- if @game.player?(@active_user) && @black_player.present? && @white_player.present? %> <%= render :template => messaging %> <%- end %> <%- if @game.player?(@active_user) && @black_player.present? && @white_player.present? %> <%= render :template => messaging %> <%- end %>Tuesday, 20 September 11

Narrowed Change <%- game_presenter.show_messaging? do %> <%= render :template => messaging %> <%- end %> class GamePresenter def initialize(game, black_payer, white_player) @game, @black_player, @white_player = game, black_player, white_player end def show_messaging?(&block) messaging_should_be_visible = @game.player?(@user) && @black_player.present? && @white_player.present? yield block if messaging_should_be_visible end endTuesday, 20 September 11

Narrowed Change <%- game_presenter.show_messaging? do %> <%= render :template => messaging %> <%- end %> class GamePresenter def initialize(game, black_payer, white_player) @game, @black_player, @white_player = game, black_player, white_player end def show_messaging?(&block) messaging_should_be_visible= @game.human_player?(@user) yield block if messaging_should_be_visible end endTuesday, 20 September 11

Sequence Change Remove Narrowed Extract control flag change methodTuesday, 20 September 11

Sequence Change Narrowed Remove Extract change control flag methodTuesday, 20 September 11

Graceful Retreat Please step away from the Yak... Slowly Shave?Tuesday, 20 September 11

http://www.refactoring.com/catalog/index.htmlTuesday, 20 September 11

Learning more from Red ‣ Smart Continuous integration ‣ Failure rate ‣ Performance ‣ FlickeringTuesday, 20 September 11

Evil hatTuesday, 20 September 11

More Books!Tuesday, 20 September 11

“To measure is to know” Lord KelvinTuesday, 20 September 11

Kiitos @josephwilk joe@josephwilk.netTuesday, 20 September 11

Kiitos @josephwilk joe@josephwilk.net GreenTuesday, 20 September 11

Kiitos @josephwilk joe@josephwilk.net Ship itTuesday, 20 September 11 Green

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Frozenrails2011

by Joseph Wilk on Sep 20, 2011

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