mjhea0/intro_to_js.md

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Intro to JS


Write, mentally evaluate, and store the result of JS expressions


Success Criteria


Why JavaScript?
Running JavaScript
Types
Operators
Console.log


Why learn JavaScript?


Only full stack web application language (Isomorphic)
Only dynamic language natively supported by the browsers
It is required
Sustained adoption
Low barrier to entry


What is JavaScript?


History


When was JavaScript created?
What is ECMAScript?
What is TC39?
How many versions of JS has there been?


Developed in 10 days in 1995 by Brendan Eich while working for Netscape.
ECMAScript Language Specification
Technical Committee 39 published the final draft of the 5th edition


Types in JavaScript


A must: wat

Types in JavaScript


string
number
boolean
null
undefined
object


Variables


var


Operators


Assignment


=
+=


Comparison


==
===
>
>=
!


Arithmetic


+
-


Logical


||
&&


Bitwise


&
|
>>
etc.


Ternary

condition ? val1 : val2

typeof

Relational


in
instanceof


Operator Precedence


Console.log


Review


Why JavaScript?
Running JavaScript
Types
Operators
Console.log