Beginners Guide to Software Development - Part 3: Basic JavaScript Data Types

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My video course to teach beginners all they need to know about software development. JavaScript programming, how to use the tools to code, the best practices, and how to run your own software business.

More fun with JavaScript and DataTypes at 4 minutes long:

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This is the first time I've ever thanked anyone for their youtube videos instructional or otherwise. THANK YOU!

audiblevideo

I have tried to learn this on many other site and videos. With this one video i learned what took me a few days in under and hour.. You help and make things so i can understand. I appreciate it alot. Thanks

henderstech

Think null and undefined are confusing? Try typing NaN === NaN into the console. It returns "false" because NaN (Not a Number) is not equal to anything, including itself! So, NaN !== NaN returns "true".

Incidentally, besides "pop", there's "shift" to remove elements from the beginning of an array. There's also "push" to add elements to the end and "unshift" to add them to the beginning. One trick I use to remember the purpose of shift vs unshift is to call them "shave" and "unshave". Shaving is a morning activity (for most of us) so it has to do with the beginning of the day ("day" rhymes with "array"). Also, to shave a beard is to remove it and to unshave it is to let it grow! (Sometimes it's necessary to come up with crazy analogies like this to remember JavaScript stuff.)

asmartbajan

That's because JavaScript "interprets" or "knows" it's a Number. In strongly typed languages, you HAVE to say it's a Number, and it's very strict. In fact, the next version of JavaScript after Harmony may have some form of manual type hinting. For example, here's JavaScript now:

var myNumber = 2;

and here's TypeScript (Microsoft's version of future JavaScript):

myNumber:number = 2;

and here's ActionScript, what Flash evolved JavaScript to:

var myNumber:Number = 2;

JesseWarden

Great video Jesse, lol at the curly braces comment. Looking forward to the other parts!

josebalius

awesome videos man. I actually am learning something from these compared to other tutorials. Btw, has anyone told you you look like Will Forte? lol

adamessmyer

8:42 im laughing since a couple of days about it :DDD such a nice person with best humour. thank u for being!!

vothkons

new rule: no more videos recorded before 11am....

JesseWarden

Hey Jesse how come you don't have to put speech marks for numbers?

hedjet

Also, JavaScript is pretty loose and weird how it handles Numbers vs. Strings. Go watch Destroy All Software's "Wat" video, I've put the link the description.

JesseWarden