Introduction

1. JavaScript
The good parts for humans
(part 1)
B Anjaneyulu Reddy
Email: anji.t6@gmail.com
Twitter: @_anji
www.evibe.in

2. Training Schedule
Day 1
o History
o Grammar
o Objects
Day 2
o Functions
o Inheritance
Day 3
o Arrays
o RegEx
o Misc
Day 4
o Bad parts
o JSON
o JSLint
o Other best practices
Day 5

3. Who is the author of JS?
Brendan Eich

4. In which year was JS shipped?
1995

5. Name the company in which JS
was born?
NetScape

6. History of JavaScript (1 of 3)
Java applets failed
o Microsoft's self implementation of Java VM
o long loading time
o native OS GUI look and feel
How Flex is different from Java applets?
Java applet vs Flash vs Silverlight

7. History of JavaScript (2 of 3)
• `Scheme` like scripting language
• Brand new programming language in 10
days
Java Scheme
Self
LiveScriptJavaScript
JScript

8. History of JavaScript (3 of 3)
W3C
ECMA - ECMA Script
Why haven't the bad parts been fixed?

9. Introduction to JS
• What is JS?
• World's most popular programming language
• World's most confused programming language
• A language of many contrasts
o Write without learning
o Loosely typed
o Prototype inheritance
o Dynamic objects
o Language with design mistake: Global variables

10. Bad parts
Global variables
Semicolon insertion
+ adds and concatenates
`typeof `
`with` and `eval`
phony array
== and !=
false, null, undefined, NaN

11. JS falsy values
false
null
undefined
NaN
'' - empty string
0 - the number 0
All other values are truthy.

12. Grammar
White Space

13. Grammar
Names
Reserved words:
abstract, boolean, break, byte, case, catch, char, class,
const, continue, debugger, default, delete, do, double,
else, enum, export, extends, false, final, finally,
float, for, function, goto, if, implements, import, in,
instanceof, int, interface, long, native, new, null,
package, private, protected, public, return, short,
static, super, switch, synchronized, this, throw,
throws, transient, true, try, typeof, var, volatile,
void, while, with, Infinity, NaN, undefined

14. Grammar
Numbers

15. Grammar
Exercise 1
1 === 1.0 ?
isNaN();
10 / 0 ?
0 / 0 ?
Number.MAX_VALUE;

16. Grammar
String
String are immutable
length, toUpperCase()
'c' + 'a' + 't' === 'cat' ?

17. Grammar
Statements
JS scoping?
JS blocks
labels - to break loops
1.html

18. Grammar
Statements

19. Grammar
Statements
disruptive statement
break statement
return statement

20. Grammar
Conditional Statements
• if
• switch
block
if statement

21. Grammar
Conditional Statements
switch statement
case clause

22. Grammar
Looping Statements
• while
• for
• do

23. Grammar
Looping Statements
for statement

24. Grammar
Expression

25. Objects
What is an Object?
Except JS simple types, everything else is an
object
{ numbers, strings, booleans, null and
undefined}
Objects are mutable keyed collection

26. Objects
literal

27. Objects
object literal

28. Objects
Exercise 2
o Sample Object
o TypeError - undefined
o || Operator
o && Operator
o pass by reference
o prototypal inheritance
 Object.beget
 dynamic relationship
o hasOwnProperty
o for in statement
o global abatement

29. Thank You