Day 3 of Windows 8 training… JavaScript OMG :-)

I am just completing the final day of some rather good Windows 8 Metro App developer training. 90% of the time we have been using JavaScript.JavaScript has many “omg” moments when compared to trusty C#. Which is why it has been very handy to have Mike T sitting next to me. If you find yourself “without Mike” (as I will next week), then I would recommend you take a look at his series of OMG posts!

JavaScript OMG! #1 to #5 

• Semi colons are optional
• Type system
• underflow/overflow/Divide by Zero
• Regular Expressions are built in
• Truth and Falsy – true unless one of undefined, null, 0, –0, Nan, “”

JavaScript OMG! #6 to #10

• Global variables live on a global object
• Expando objects
• Wrappers
• Type conversions
• Object to primitive conversions

JavaScript OMG! #11 to #15

• Variable Scope – no scope blocks, can use before declare
• Bitwise operators – avoid
• Equality and Strict Equality – === and !==
• “use strict” – use it!
• Magic of short-circuiting ANDs and Truthy/Falssy

JavaScript OMG!: #16 to #20

• Optional Function Arguments
• Nested Functions
• Arrays vs Lists
• Function Invocation Context and Strict Mode
• Nested functions and Invocation Context

JavaScript OMG #21 to #25

• Everything is a function
• array.sort won’t sort numbers correctly
• parseInt() needs help
• Callbacks and scope
• Function Literals create functions

JavaScript OMG #26 to #30

• Partial Application and Mapping
• Self Defining Functions
• This or That
• Events
• And finally… “It’s just like everywhere”