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Javascript
the
New Parts
federico.galassi@cleancode.it
slideshare.net/fgalassi
• Short history of javascript
• State of the onion
• The new parts
Javascript
public in
1996
No time to fix
Standard 1999
Ecmascript
3rd edition
“Worst name ever”
TC39
Committee
Years later...
“It turns out that standard bodies are
not good places to innovate. That’s
what laboratories and startups are
for. Standards must be drafted by
consensus.”
http://yuiblog.com/blog/2008/08/14/premature-standardization/
They couldn’t agree
ES 3.1
small
fixes
ES 4
heavy
stuff
split
ES 3.1
Ecmascript
5th edition
the winner
the loser
ES 4
Harmony
ES5
just fixes
javascript
• Short history of javascript
• State of the onion
• The new parts
Better
object oriented
programming
Javascript
is prototypal
surname: “simpsons”
simpsons
name: “bart”
bart
prototype
bart.surname
>  “simpsons”
Wannabe classical
function  Simpsons(name)  {
this.name  =  name
}
Simpsons.prototype.surname  =  
“simpsons”
bart  =  new  Simpsons(“bart”)
constructor
class
object
Ugly
Create objects
simpsons  =  {  surname:  “simpsons”  }
bart  =  Object.create(simpsons)
bart.name  =  “bart”
bart.age  =  10
hugo  =  Object.create(bart)
hugo.name  =  “hugo”
hugo.nature  =  “evil”
object
object
object
Simple
and
Powerful
Back to the father
homer  =  Object.create(
Object.getPrototypeOf(bart)
)
homer.name  =  “homer”
homer.age  =  38
Getters and setters
homer  =  {
beers:  3,
get  drunk()  {
return  this.beers  >  5
}
}
homer.drunk
>  false
homer.beers  =  7
homer.drunk
>  true
Uniform
access
bart.age
>  10
Properties
were values
Object.getOwnPropertyDescriptor(
bart,  “age”
)
>  {
value:  10,
enumerable:  true,
writable:  true,
configurable:  true
}
Properties
now configurable
Object.defineProperty(bart,  “age”,  {
value:  10,
enumerable:  true,
writable:  true,
configurable:  true
})
Properties
can be defined
Object.defineProperties(bart,  {
name:  {
value:  “bart”,
enumerable:  true,
writable:  true,
configurable:  true
},
age:  {
value:  10,
enumerable:  true,
writable:  true,
configurable:  true
}
})
More than one
bart  =  Object.create(simpsons,  {
name:  {
value:  “bart”,
enumerable:  true,
writable:  true,
configurable:  true
},
age:  {
value:  10,
enumerable:  true,
writable:  true,
configurable:  true
}
})
At creation time
Better
security
writable
Can i assign to it ?
Object.defineProperty(bart,  “age”,  {
value:  10,
writable:  false
})
bart.age  =  5
>  5
bart.age
>  10
configurable
Can i delete it ?
Object.defineProperty(bart,  “age”,  {
value:  10,
configurable:  false
})
delete  bart.age
>  false
bart.age
>  10
configurable
Can i configure it ?
Object.defineProperty(bart,  “age”,  {
value:  10,
configurable:  false
})
Object.defineProperty(bart,  “age”,  {
configurable:  true
})
>  TypeError:  Cannot  redefine  property
enumerable
+
writable
security
Even more
security
//  Can’t  add  properties
Object.preventExtensions(obj)
//  !isExtensible  +  all  configurable  =  false
Object.seal(obj)
//  isSealed  +  all  writable  =  false
Object.freeze(obj)
Object.isExtensible(obj)
Object.isSealed(obj)
Object.isFrozen(obj)
The road to
safe mashups
Better
extensibility
enumerable
Does for/in show it up ?
Object.defineProperty(bart,  “phobia”,  {
value:  “coffins”,
enumerable:  false
})
//  Like  for/in  and  collect  keys
Object.keys(bart)
>  [“name”,  “surname”,  “age”]
No more
pollution
Hide behavior
Object.defineProperty(bart,  “play”,  {
value:  function()  {  ..play..  },
enumerable:  false
})
natives finally
extensible !
Object.defineProperty(Array.prototype,  
“last”,  {
value:  function()  {
return  this[this.length  -­‐  1]
},
enumerable:  false
})
[4,3,5,1].last()
>  1
more native
with getter
Object.defineProperty(Array.prototype,  
“last”,  {
get:  function()  {
return  this[this.length  -­‐  1]
},
enumerable:  false
})
[4,3,5,1].last
>  1
works with
DOM
Object.defineProperty(HTMLElement.prototype,  
“classes”,  {
get:  function()  {
return  this.getAttribute(“class”)
                      .split(/s+/)
},
enumerable:  false
})
$(“<div  class=‘one  two’  />”).get(0).classes
>  [“one”,  “two”]
The world
is yours
Better
performance
//  Native  json
JSON.parse(string)
JSON.stringify(object)
Better
functional
programming
[1,  2,  3].map(double)
>  [2,  4,  6]
[2,  4,  6].every(isEven)
>  true
[1,  2,  3].filter(isEven)
>  [2]
//  forEach,  some,  reduce,  reduceRight
//  indexOf,  lastIndexOf
Function.bind()
var  bart  =  {
name:  “bart”
}
var  hello  =  function(greet)  {
return  greet  +  “i  am  “  +  this.name
}
//  bind  to  this  and  partial  application
(hello.bind(bart,  “hey”))()
>  “hey,  i  am  bart”
More
operations on
natives
Array.isArray([1,2,3])
>  true
“        hello  world          ”.trim()
>  “hello  world”
Date.now()
>  1289395540416
//  reserved  keyword  as  properties
bart.class  =  “cartoon”
//  abstract,  boolean,  byte,  char,  const  ...
//  OK  trailing  comma
[1,  2,  3,  ]  
//  OK  trailing  comma
{
name:  “bart”,
}
//  8  instead  of  0  !!!
parseInt(“08”)
No more
annoyances
JOY
• Short history of javascript
• State of the onion
• The new parts
State of the
Onion
Onion because
you can start crying
http://kangax.github.com/es5-compat-table/
7 8 9
no IE6
I don’t
shoot the
red cross
http://kangax.github.com/es5-compat-table/
3 3.5 4
http://kangax.github.com/es5-compat-table/
3.2 4 5 webkit
http://kangax.github.com/es5-compat-table/
5 6 7
http://kangax.github.com/es5-compat-table/
10.1 10.6 10.7
My pick is
chrome
chrome 7
Modern
Browsers
OK
Old
Browsers
ARGH
The real
problem
“IE6 is fading very slowly. Five years
ago I predicted that IE6 would fade
away in five years.”
even worse
Go figure
we need a Miracle
federico.galassi@cleancode.it
Questions?

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