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Asked by Uday Last Modified
Answer 
Naga Swathi
IT Professional Trainer with 15 years of experience in IT Industry
Start with hello world.
Use Node to run your JavaScript programs. Ideally, use Jasmine to write test harnesses.
Here's a heads-up:
It's not OO like you know it
It has no private keyword: you use function closures to do this
There are no classes, except in ES6. They are not totally the same as C++ classes
The 'this' pointer can be reassigned. It has different rules to those in C++
Variables declared with var do not have block scope like in C++, and their type can be changed at will
Type coercion rules are woolly
== tests for 'roughly equals' You need === for exact checks
null, undefined, zero and NaN differ in behaviour
Exceptions are untyped. There are no destructors
It's memory managed, new does not need delete
delete exists but is not the same as in C++
There are no collection classes.
There are a lot of callbacks
Functions are JavaScript objects, and this is really good. Functions start a closure which is a unit of scope and encapsulation
There are three ways to make an object
Objects have prototypes, and inheritance is done that way
There are no interfaces. You call methods and they either work or fail
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