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![DOUBLE AND TRIPLE EQUALSa)1 == “1”a)1 == truea)“1” == truea)1 == “ 1 “a)1 == [1]f) null == undefinedf) 1 == 1f) “ “ == falsef) NaN == NaNf) 1 == “true”](/image.pl?url=https%3a%2f%2fimage.slidesharecdn.com%2fjavascriptppt-130607080348-phpapp01%2f75%2fJava-script-ppt-4-2048.jpg&f=jpg&w=240)
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Java script ppt
The document summarizes lessons from talks on modern JavaScript, emphasizing the importance of writing quality code and understanding JavaScript's nuances, such as strict equality and hoisting. It touches on various topics like mobile development, function scope, and design patterns, while encouraging further learning and testing practices. Useful resources and recommended next steps for improving JavaScript skills are also provided.
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Java script ppt
- 1.JAVASCRIPT DOJOLessons andthoughtsfrom DevWeek
- 2.TALKS ATTENDED• “ModernJavaScript” - K. Scott Allen• “Just because it’s JavaScript doesn’t give youthe right to write rubbish!” – Hadi Hariri• Mobile development with MVC4 and jQueryMobile – Brock Allen
- 3.
- 4.DOUBLE AND TRIPLEEQUALSa)1 == “1”a)1 == truea)“1” == truea)1 == “ 1 “a)1 == [1]f) null == undefinedf) 1 == 1f) “ “ == falsef) NaN == NaNf) 1 == “true”
- 5.Prefer strict equals=== to ==
- 6.
- 7.SCOPEA/(function () {if(true) {var functionScope = "functionScope";}return functionScope;})();B/var functionScope = "functionScope";(function () {return functionScope;})();C/(function () {var test = function () {var functionScope = "functionScope";}return functionScope;})();D/(function () {var functionScope = 0;var functionScope = “functionScope”;return function}
- 8.
- 9.Function scope meansthat allvariables and parametersdeclared inside a function arevisible everywhere within thefunction.
- 10.FUNCTION DECLARATIONSVS FUNCTIONEXPRESSIONSFunction Declarationfunction functionDeclaration() {return “I’m a function declaration”;}Function Expressionvar functionExpression = function() {return “I’m a function expression”;};
- 11.AUTOMATIC SEMICOLONINSERTIONUsing semicolonsin JavaScript is optional BUTJavaScript inserts them automatically.Don't forget to use new on constructor functions.New and This
- 12.TECHNIQUES• Constructor protection•Encapsulation• Placing methods on the prototype• Self executing functions• Namespaces• Module Pattern / Revealing module pattern
- 13.
- 14.STORE FUNCTIONS ONTHEPROTOTYPE
- 15.HADI HARIRI• “It’sjust JavaScript!”• “JavaScript is write once code – you never want to go back toit and change it”• “People think that JavaScript is not maintainable.”• “People think SRP doesn’t exist in JavaScript – how can a classhave a single responsibility if there isn’t a class”• “We care in C#, we care in Java....why not JavaScript?”
- 16.NEXT STEPS• KnowJavaScript better.• Be able to write and run tests easily in VisualStudio.• Write real world JavaScript tests withmocking.• Get intellisense in Visual Studio• Be able to run tests as part of Team City build• Have tools which will help me improve the
- 17.USEFUL LINKS• KScott Allen’s blog - www.odetocode.com/blogs/all• Hadi Hariri , same talk in Norway – http://vimeo.com/43536490• Basic JavaScript blog posts – http://elegantcode.com/2011/03/24/basic-javascript-part-12-function-hoisting• JavaScript sketch pad – http://jsfiddle.net• Free Book (now published by O’Reilly) based on ECMAScript version 3http://javascriptenlightment.com/JavaScript_Enlightenment.pdf• JavaScript performance test bed – http://jsperf.com