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I’M AFRAID OF JAVASCRIPT

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AHOY FRIEND!

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@searls

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every developer FEAR shares a secret

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...my code sucks? WHAT IF

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BUT WE COPE POORLY

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stupid things we do: we pair less often we share less often we change less often

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we defer too often stupid things we do: we defend too often we deflect too often

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say it with me: “My Code Sucks”

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say it with me: “My Code Sucks” sometimes

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say it with me: “My Code Sucks” maybe

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say it with me: “My Code Sucks” if you say so

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SO FIGHT THE FEAR

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and fail PROUDLY

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JavaScript! as we talk

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just throw away classes & interfaces strong typing most keywords ORACLE (or MS) JAVASCRIPT IS BASICALLY JAVA (OR C#)

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JAVASCRIPT IS BASICALLY JAVA (OR C#) and then add 1st class functions object literals tons of gotchas healthy open source libs

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CoffeeScript! as we talk

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just throw away mixins & modules method_missing def and end easy debugging COFFEESCRIPT IS BASICALLY RUBY (OR PYTHON)

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and then add list comprehension object literals existential operator huge install base COFFEESCRIPT IS BASICALLY RUBY (OR PYTHON)

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YOUR PAIR

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YOUR PAIR GRABS A CARD

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so you say, “let’s use JavaScript!”

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but your pair’s all like

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she says, “Start with the simplest thing that could possibly work!”

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!== simplest easiest

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!== simplest most familiar

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!== simplest calling a server to sort an array & render HTML for you

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so simple!‚

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WHAT GOOD ARE YOUR SERVERS?

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security persisting data analytics model behavior HTML templating routing users proxying UI events things servers are great at

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security persisting data analytics proxying things servers are great at

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model behavior HTML templating routing users UI events it’s simpler when the client handles

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DON’T PANIC

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YOU’VE GOT THIS

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model behavior HTML templating routing users UI events

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jasmine

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describe()

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it()

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expect().toBe()

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expect().not.toBe()

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beforeEach()

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run it yourself! http://is.gd/logic1 describe('CallList', function() { });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { describe("#moveUp", function() { }); });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { describe("#moveUp", function() { context("moving up C", function() { }); }); });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { describe("#moveUp", function() { context("moving up C", function() { it("places it above B", function() { }); }); }); });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() { it("places it above B", function() { }); }); }); });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() { beforeEach(function() { subject.moveUp('C'); }); it("places it above B", function() { }); }); }); });

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run it yourself! http://is.gd/logic1 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() { beforeEach(function() { subject.moveUp('C'); }); it("places it above B", function() { expect(subject.get('items')).toEqual(['A','C','B']); }); }); }); });

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run it yourself! http://is.gd/logic1

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run it yourself! http://is.gd/logic1 window.CallList = Backbone.Model.extend({ });

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run it yourself! http://is.gd/logic1 window.CallList = Backbone.Model.extend({ moveUp: function(item) { } });

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run it yourself! http://is.gd/logic1 window.CallList = Backbone.Model.extend({ moveUp: function(item) { this.set({items: ['A','C','B']}); } });

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run it yourself! http://is.gd/logic1

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run it yourself! http://is.gd/logic2 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() { }); }); });

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run it yourself! http://is.gd/logic2 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() { it("places B above A", function() { }); }); }); });

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run it yourself! http://is.gd/logic2 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() { beforeEach(function() { subject.moveUp('B'); }); it("places B above A", function() { }); }); }); });

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run it yourself! http://is.gd/logic2 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() { beforeEach(function() { subject.moveUp('B'); }); it("places B above A", function() { expect(subject.get('items')).toEqual(['B','A','C']); }); }); }); });

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run it yourself! http://is.gd/logic2

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run it yourself! http://is.gd/logic2 window.CallList = Backbone.Model.extend({ moveUp: function(item) { var items = this.get('items'); } });

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run it yourself! http://is.gd/logic2 window.CallList = Backbone.Model.extend({ moveUp: function(item) { var items = this.get('items'); var index = _(items).indexOf(item) - 1; } });

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run it yourself! http://is.gd/logic2 window.CallList = Backbone.Model.extend({ moveUp: function(item) { var items = this.get('items'); var index = _(items).indexOf(item) - 1; items.splice(index,2,item,items[index]); } });

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run it yourself! http://is.gd/logic2

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run it yourself! http://is.gd/logic3 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() {...}); context("moving up A", function() { }); }); });

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run it yourself! http://is.gd/logic3 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() {...}); context("moving up A", function() { it("leaves the items as they were", function() { }); }); }); });

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run it yourself! http://is.gd/logic3 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() {...}); context("moving up A", function() { beforeEach(function() { subject.moveUp('A'); }); it("leaves the items as they were", function() { }); }); }); });

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run it yourself! http://is.gd/logic3 describe('CallList', function() { var subject; beforeEach(function() { subject = new CallList({items: ['A','B','C']}); }); describe("#moveUp", function() { context("moving up C", function() {...}); context("moving up B", function() {...}); context("moving up A", function() { beforeEach(function() { subject.moveUp('A'); }); it("leaves the items as they were", function() { expect(subject.get('items')).toEqual(['A','B','C']); }); }); }); });

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run it yourself! http://is.gd/logic3

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run it yourself! http://is.gd/logic3

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run it yourself! http://is.gd/logic3 window.CallList = Backbone.Model.extend({ moveUp: function(item) { var items = this.get('items'); var index = _(items).indexOf(item) - 1; items.splice(index,2,item,items[index]); } });

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run it yourself! http://is.gd/logic3 window.CallList = Backbone.Model.extend({ moveUp: function(item) { var items = this.get('items'); var index = _(items).indexOf(item) - 1; if(index >= 0) { items.splice(index,2,item,items[index]); } } });

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run it yourself! http://is.gd/logic3

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model behavior HTML templating routing users UI events

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backbone

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view model 00 00 UI Event Occurs! “click .move-up”

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view model 00 00 this.model.moveUp(‘C’)

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view model 00 00 this.set({ items:[‘A’,’C’,’B’] });

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view model 00 00 Model Event Fired! “change:items”

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view model 00 00 change:items bound! this.render()

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view model 00 00 01

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and now you know backbone!

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run it yourself! http://is.gd/view1 describe "CallListView", ->

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HOLD THE ☎

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CoffeeScript

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function(){}

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->

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() {} ;

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optional

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this.foo

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@foo

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employee.group.department.company.yuck

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employee.group.department.company.yuck TypeError: 'undefined' is not an object

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?. enter the existential operator

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employee?.group?.department?.company?.yuck

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employee?.group?.department?.company?.yuck now, merely “undefined”

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employee?.group?.department?.company?.yuck now, merely “undefined” It’s Demeter-tastic!

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run it yourself! http://is.gd/view1 describe "CallListView", -> describe "events", ->

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run it yourself! http://is.gd/view1 describe "CallListView", -> describe "events", -> it "binds to up-arrow clicks", ->

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run it yourself! http://is.gd/view1 describe "CallListView", -> beforeEach -> @subject = new CallListView describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp'

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run it yourself! http://is.gd/view1

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run it yourself! http://is.gd/view1 class CallListView extends Backbone.View

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run it yourself! http://is.gd/view1 class CallListView extends Backbone.View events: "click .up-arrow": "moveUp"

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run it yourself! http://is.gd/view1

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run it yourself! http://is.gd/view1

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run it yourself! http://is.gd/view1 class CallListView extends Backbone.View events: "click .up-arrow": "moveUp" moveUp: ->

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run it yourself! http://is.gd/view1

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jasmine spies

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spyOn(object,‘method’)

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spyOn(object,‘method’) jasmine.createSpy(‘method’)

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spyOn(object,‘method’) jasmine.createSpy(‘method’) jasmine.createSpyObj(‘Name’,[‘method1’,‘method2’])

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stubbing

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spyOn(panda,‘isHappy’)

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spyOn(panda,‘isHappy’) panda.isHappy.andReturn(true)

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spyOn(panda,‘isHappy’) panda.isHappy.andReturn(true) panda.isHappy()

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spyOn(panda,‘isHappy’) panda.isHappy.andReturn(true) panda.isHappy() returns true

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verifying

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spyOn(panda,‘feed’)

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spyOn(panda,‘feed’) panda.feed()

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spyOn(panda,‘feed’) expect(panda.feed).toHaveBeenCalled() panda.feed()

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @subject = new CallListView describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> it "tells the model to move up the arrow's text", ->

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> it "tells the model to move up the arrow's text", ->

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> beforeEach -> $upArrow = $(@subject.el).inject('up-arrow').text('C') it "tells the model to move up the arrow's text", ->

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> beforeEach -> $upArrow = $(@subject.el).inject('up-arrow').text('C') it "tells the model to move up the arrow's text", -> jasmine-fixture https://github.com/searls/jasmine-fixture

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> beforeEach -> $upArrow = $(@subject.el).inject('up-arrow').text('C') @subject.moveUp target: $upArrow[0] it "tells the model to move up the arrow's text", ->

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run it yourself! http://is.gd/view2 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> it "binds to up-arrow clicks", -> expect(@subject.events).toEqual "click .up-arrow": 'moveUp' describe "#moveUp", -> beforeEach -> $upArrow = $(@subject.el).inject('up-arrow').text('C') @subject.moveUp target: $upArrow[0] it "tells the model to move up the arrow's text", -> expect(@model.moveUp).toHaveBeenCalledWith 'C'

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run it yourself! http://is.gd/view2

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run it yourself! http://is.gd/view2 class CallListView extends Backbone.View events: "click .up-arrow": "moveUp" moveUp: (e) -> @model.moveUp $(e.target).text()

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run it yourself! http://is.gd/view2

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HTML templating model behavior routing users UI events

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> it "renders the template with the model's JSON", ->

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> it "renders the template with the model's JSON", -> expect($(@subject.el)).toHaveHtml('HTML for bar')

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> it "renders the template with the model's JSON", -> expect($(@subject.el)).toHaveHtml('HTML for bar') jasmine-jquery https://github.com/velesin/jasmine-jquery

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> beforeEach -> @subject.render() it "renders the template with the model's JSON", -> expect($(@subject.el)).toHaveHtml('HTML for bar')

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> @model = jasmine.createSpyObj('CallList',['bind','moveUp','toJSON']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> beforeEach -> @model.toJSON.andReturn foo: "bar" @subject.render() it "renders the template with the model's JSON", -> expect($(@subject.el)).toHaveHtml('HTML for bar')

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run it yourself! http://is.gd/template1 describe "CallListView", -> beforeEach -> $template = inject('') $template.html('HTML for <%= foo %>') @model = jasmine.createSpyObj('CallList',['bind','moveUp','toJSON']) @subject = new CallListView model: @model describe "events", -> ... describe "#moveUp", -> ... describe "#render", -> beforeEach -> @model.toJSON.andReturn foo: "bar" @subject.render() it "renders the template with the model's JSON", -> expect($(@subject.el)).toHaveHtml('HTML for bar')

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run it yourself! http://is.gd/template1

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run it yourself! http://is.gd/template1 class CallListView extends Backbone.View events: "click .up-arrow": "moveUp" initialize: -> @template = _.template($('#call-list-template').html()) moveUp: (e) -> @model.moveUp $(e.target).text()

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run it yourself! http://is.gd/template1 class CallListView extends Backbone.View events: "click .up-arrow": "moveUp" initialize: -> @template = _.template($('#call-list-template').html()) moveUp: (e) -> @model.moveUp $(e.target).text() render: -> $(@el).html(@template(@model.toJSON()))

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run it yourself! http://is.gd/template1

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routing users HTML templating model behavior UI events

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router

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class AppRouter extends Backbone.Router routes: “call-list”: “callList” callList: -> new CallListView(model: new CallList).render()

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$ -> window.router = new AppRouter(); Backbone.history.start();

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$ -> window.router = new AppRouter(); Backbone.history.start(); http://yourapp.dev/#call-list

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$ -> window.router = new AppRouter(); Backbone.history.start(); http://yourapp.dev/#call-list router.navigate('call-list',true)

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phew.

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PARTING GIFTS!

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jasmine helpers jQuery Spec’n https://github.com/velesin/jasmine-jquery HTML Inject’n https://github.com/searls/jasmine-fixture Conditional Stub’n https://github.com/searls/jasmine-stealth Given-When-Then’n https://github.com/searls/jasmine-given

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code helpers Underscore.js http://documentcloud.github.com/underscore extend.js https://github.com/searls/extend.js Date.js http://www.datejs.com Underscore.string http://epeli.github.com/underscore.string/

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Runner/CI Helpers jasmine-headless-webkit http://johnbintz.github.com/jasmine-headless-webkit/ jasmine-maven-plugin http://searls.github.com/jasmine-maven-plugin/ jasmine-gem https://github.com/pivotal/jasmine-gem jasmine-rails https://github.com/searls/jasmine-rails

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github.com/searls +I’ll help!

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@searls +I’ll help!

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[email protected] +I’ll help!

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•g l e e * for the color scheme •clafouti for the despair statue •SteveFE for the pouting girl •ifollowtherabbit for another color scheme •mokra for the jaw-dropped baby •Epicality for the third color scheme credits