Debugging Ember.js - Speaker Deck

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Tips & tricks for bug assassination DEBUGGING EMBER.

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■ Debugging JavaScript ■ Debugging Ember ■ Help Us Help You DEBUGGING EMBER.

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■ Web Inspector ■ JSHint ■ Demo Tips & tricks for debugging JavaScript on the web. DEBUGGING JAVASCRIPT.

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THE MOST IMPORTANT TOOL IN YOUR TOOLBOX.

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■ Console ■ File navigation ■ Breakpoints ■ Execution control TOOLS.

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Console Navigation Breakpoints Execution Control

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console.log("hello, world!"); CONSOLE.

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CONSOLE. Console Output

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■ Break on Exception ■ Breakpoints ■ debugger; PAUSING EXECUTION.

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BREAK ON EXCEPTION. Don’t Break (grey)

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BREAK ON EXCEPTION. Break on Exception (blue)

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BREAK ON EXCEPTION. Break on Uncaught Exception (purple)

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BREAKPOINTS. Breakpoint (click to set) All Breakpoints

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// Why is this kicking // puppies?! if (shouldntBePossible) { this.kickPuppies(); } DEBUGGER STATEMENT. debugger;

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PAUSED EXECUTION.

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CALL STACK.

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STEP INTO STEP OVER STEP OUT

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EXAM APP STATE.

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JSHINT.

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DEMO

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■ Namespaces ■ Don’t fear the stack trace ■ Understanding common errors ■ Logging ■ Advanced debug-foo Tips & tricks speci c to Ember.js apps. DEBUGGING EMBER.JS

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>> Core = Ember.Namespace.create(); >> Core.Person = Ember.Person.extend(); >> Core.Person.toString(); => Core.Person >> Core.Person.create().toString(); => NAMESPACES.

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UNDERSTAND STACK TRACES.

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IDENTIFY FRAMEWORK CODE AND APP CODE.

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THE ERROR IS OFTEN IN YOUR APP CODE— IF YOU GO UP FAR ENOUGH.

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LOGGING.

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Ember.LOG_BINDINGS = true; LOG BINDINGS SYNC.

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stateManager.LOG_STATE_TRANSITIONS = true; LOG STATE MANAGERS

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person = Ember.Object.create({ name: "Tom" }); OVERRIDE PROPERTIES.

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person = Ember.Object.create({ name: function() { // Break whenever name is // get or set. debugger; }.property() }); OVERRIDE PROPERTIES.

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Ember.View.reopen({ $: function() { debugger; return this._super.apply(this, arguments); } }); MONKEYPATCH CLASSES.

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WINDOW.BILLY

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THEY TOLD ME I COULD BE ANYTHING

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Ember.View.reopen({ $: function() { if (window.billy) { debugger; } return this._super.apply(this, arguments); } }); WINDOW.BILLY

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ACCESSING VIEWS.

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ACCESSING VIEWS.

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DEBUGGING HANDLEBARS.

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DEMO

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■ Creating reduced test cases with jsFiddle ■ Running and writing unit tests ■ Better asserts Making Ember.js easier for you and others. HELP US HELP YOU