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Sustainable Software

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Who uses JavaScript?

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Who’s familiar with Test-Driven Development?

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Who has code that’s difficult to change?

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pain points

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to pain points

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to pain points

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to pain points

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to pain points

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to which leads to

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours which leads to

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours which leads to

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours which leads to

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours which leads to

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours but we value

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital but we value

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital but we value

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital but we value

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital but we value

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital our values are compromised

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital takes too long for finished features to get into production documentation slows progress; key people become bottlenecks communication cost slows down implementation wastes money & good-will; exacerbates quality issues our values are compromised

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital takes too long for finished features to get into production documentation slows progress; key people become bottlenecks communication cost slows down implementation wastes money & good-will; exacerbates quality issues our values are compromised

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital takes too long for finished features to get into production documentation slows progress; key people become bottlenecks communication cost slows down implementation wastes money & good-will; exacerbates quality issues our values are compromised

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adding new code breaks existing functionality intent & value of the code is unclear HTML & JavaScript become codependent it takes longer to add a new feature than it used to manual regression testing, change control processes rely on documentation, original authors to retain knowledge developers and designers closely coordinate each change hiring more people, working longer hours shipping features to users constantly avoiding commitments to non-critical concerns minimizing time to turn ideas into reality getting the most out of each infusion of capital takes too long for finished features to get into production documentation slows progress; key people become bottlenecks communication cost slows down implementation wastes money & good-will; exacerbates quality issues our values are compromised

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vicious cycle more bugs communication drag higher carrying cost slower delivery

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vicious cycle more bugs communication drag higher carrying cost slower delivery more indirection

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vicious cycle more bugs communication drag higher carrying cost slower delivery less feedback more indirection

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vicious cycle more bugs communication drag higher carrying cost slower delivery more overtime less feedback more indirection

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vicious cycle more bugs communication drag higher carrying cost slower delivery more overtime less feedback greater risk more indirection

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what if? new code didn’t risk breaking existing functionality? all code was sufficiently documented as it was developed? code was modular enough to survive UI changes, multiple client platforms? adding new features became easier over time?

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what if? new code didn’t risk breaking existing functionality? all code was sufficiently documented as it was developed? code was modular enough to survive UI changes, multiple client platforms? adding new features became easier over time?

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what if? new code didn’t risk breaking existing functionality? all code was sufficiently documented as it was developed? code was modular enough to survive UI changes, multiple client platforms? adding new features became easier over time?

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what if? new code didn’t risk breaking existing functionality? all code was sufficiently documented as it was developed? code was modular enough to survive UI changes, multiple client platforms? adding new features became easier over time?

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virtuous cycle fewer bugs more autonomy easier to change more rapid delivery

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virtuous cycle fewer bugs more autonomy easier to change more rapid delivery more confidence

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virtuous cycle fewer bugs more autonomy easier to change more rapid delivery greater value more confidence

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virtuous cycle fewer bugs more autonomy easier to change more rapid delivery more balance greater value more confidence

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virtuous cycle fewer bugs more autonomy easier to change more rapid delivery more balance greater value less risk more confidence

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1. sketch it I want to go to there!

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1. sketch it 2. spike it I want to go to there!

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1. sketch it 2. spike it 3. spec it I want to go to there!

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draw it

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make it work

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throw it away

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spec it

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build it to last

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refactor it

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let’s see an example

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in your spike, suppose you used

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$('.add-task').live('click',function(e) { e.preventDefault(); $(this).append('
New Task!
'); });

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how might we spec adding tasks?

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describe('#addTask', function(){ it('appends a div'); });

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describe('#addTask', function(){ it('appends a div', function(){ expect($container).toContain('div'); }); });

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describe('#addTask', function(){ it('appends a div', function(){ var $container = $('
'); expect($container).toContain('div'); }); });

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describe('#addTask', function(){ it('appends a div', function(){ var $container = $('
'); addTask.call($container); expect($container).toContain('div'); }); });

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window.addTask = function(){ this.append('
'); }; describe('#addTask', function(){ it('appends a div', function(){ var $container = $('
'); addTask.call($container); expect($container).toContain('div'); }); });

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describe('#addTask', function(){ it('appends a div', function(){ var $container = $('
'); addTask.call($container); expect($container).toContain('div'); }); it('includes a default text label', function(){ var $container = $('
'); addTask.call($container); expect($container).toHaveText('New Task!'); }); });

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window.addTask = function(){ this.append('
New Task!
'); }; describe('#addTask', function(){ ... it('includes a default text label', function(){ var $container = $('
'); addTask.call($container); expect($container).toHaveText('New Task!'); }); });

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describe('#addTask', function(){ it('appends a div', function(){ var $container = $('
'); addTask.call($container); expect($container).toContain('div'); }); it('includes a default text label', function(){ var $container = $('
'); addTask.call($container); expect($container).toHaveText('New Task!'); }); });

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describe('#addTask', function(){ var $container; beforeEach(function(){ $container = $('
'); addTask.call($container); }); it('appends a div', function(){ expect($container).toContain('div'); }); it('includes a default text label', function(){ expect($container).toHaveText('New Task!'); }); });

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describe('#addTask', function(){ var $container; beforeEach(function(){ $container = $('
'); addTask.call($container); }); it('appends a div', function(){ expect($container).toContain('div'); }); it('includes a default text label', function(){ expect($container).toHaveText('New Task!'); }); }); jasmine-jquery http://is.gd/jasminejquery

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how might we spec event binding?

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describe('#clicker', function(){ it('triggers the event handler', function(){ expect(handler).toHaveBeenCalledWith(event); }); });

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describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); expect(handler).toHaveBeenCalledWith(event); }); });

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describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); expect(handler).toHaveBeenCalledWith(event); }); });

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describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(handler).toHaveBeenCalledWith(event); }); });

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var clicker = function(selector, whenClicked){ }; describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(handler).toHaveBeenCalledWith(event); }); });

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var clicker = function(selector, whenClicked){ $(selector).live('click',function(e) { whenClicked(e); }); }; describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(handler).toHaveBeenCalledWith(event); }); });

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var clicker = function(selector, whenClicked){ $(selector).live('click',function(e) { whenClicked(e); }); }; describe('#clicker', function(){ ... it('prevents default browser behavior', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); spyOn(event,'preventDefault'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(event.preventDefault).toHaveBeenCalled(); }); });

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var clicker = function(selector, whenClicked){ $(selector).live('click',function(e) { e.preventDefault(); whenClicked(e); }); }; describe('#clicker', function(){ ... it('prevents default browser behavior', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); spyOn(event,'preventDefault'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(event.preventDefault).toHaveBeenCalled(); }); });

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describe('#clicker', function(){ it('triggers the event handler', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(handler).toHaveBeenCalledWith(event); }); it('prevents default browser behavior', function(){ var handler = jasmine.createSpy('handles clicks'); var event = $.Event('click'); spyOn(event,'preventDefault'); $.jasmine.inject('
'); clicker('.my-button',handler); $('.my-button').trigger(event); expect(event.preventDefault).toHaveBeenCalled(); }); });

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describe('#clicker',function(){ var handler, event; beforeEach(function(){ handler = jasmine.createSpy('handles clicks'); event = $.Event('click'); spyOn(event,'preventDefault'); $.jasmine.inject('
'); }); context('when you click the button',function(){ beforeEach(function(){ clicker('.my-button',handler); $('.my-button').trigger(event); }); it('triggers the event handler',function(){ expect(handler).toHaveBeenCalledWith(event); }); it('prevents default browser behavior',function(){ expect(event.preventDefault).toHaveBeenCalled(); }); }); });

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describe('#clicker',function(){ var handler, event; beforeEach(function(){ handler = jasmine.createSpy('handles clicks'); event = $.Event('click'); spyOn(event,'preventDefault'); $.jasmine.inject('
'); }); context('when you click the button',function(){ beforeEach(function(){ clicker('.my-button',handler); $('.my-button').trigger(event); }); it('triggers the event handler',function(){ expect(handler).toHaveBeenCalledWith(event); }); it('prevents default browser behavior',function(){ expect(event.preventDefault).toHaveBeenCalled(); }); it('binds `this` to the jQuery result object',function(){ expect(handler.mostRecentCall.object).toBe('.my-button'); }); }); });

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var clicker = function(selector, whenClicked){ $(selector).live('click',function(e) { e.preventDefault(); whenClicked.call($(this),e); }); }; describe('#clicker', function(){ ... context('when you click the button',function(){ ... it('binds `this` to the jQuery result object',function(){ expect(handler.mostRecentCall.object).toBe('.my-button'); }); }); });

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our new production code

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window.addTask = function(){ this.append('
New Task!
'); }; var clicker = function(selector, whenClicked){ $(selector).live('click',function(e) { e.preventDefault(); whenClicked.call($(this),e); }); }; clicker('.add-task', addTask);

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$('.add-task').live('click',function(e) { e.preventDefault(); $(this).append('
New Task!
'); });

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Taking the next step

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try jasmine https://try-jasmine.heroku.com

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http://try-jasmine.heroku.com

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download jasmine http://is.gd/downloadjasmine

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try jasmine-rails https://github.com/searls/jasmine-rails

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learn more about test-driven development http://is.gd/tddbook

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ask us questions and we’ll try to help

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thank you! [email protected] Boulder UX, Boulder, CO September 12, 2011 @searls seefl[email protected] @seeflanigan Thanks to Brandon Keepers (@bkeepers) for the Keynote template! find this talk at http://is.gd/jasmineux