JavaScript Backend

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brett hartshorn edited this page Jul 23, 2015 · 17 revisions

gotchas

methods can not be directly passed as callback functions, because in javascript you need to worry about the calling-context-of-this. To properly pass a method as a callback use bind like this: F( ob.mymethod.bind(ob) ) where F is a function that takes a callback.
dictionary (object) keys are always strings, however the builtin method mydict.keys() will return an array of numbers if all the keys are string integers, this allows you to do things like max( mydict.keys() ) to get the key of the highest number.
when using external libraries, you must use new SomeClass() to create instances.

specialized syntax

classes

multiple inheritance
operator overloading (explicit)
function and class decorators
getter/setter function decorators
list comprehensions
regular and lambda functions
function calls with *args and **kwargs

Language Keywords

global, nonlocal
while, for, continue, break
if, elif, else,
switch, case
try, except, raise
def, lambda
new, class
from, import, as
pass, assert
and, or, is, in, not
return, yield

HTML DOM Iterables

for item in iterable

NodeList
FileList
ClientRectList
DOMSettableTokenList
DOMStringList
DataTransferItemList
HTMLCollection
HTMLAllCollection
SVGElementInstanceList
SVGNumberList
SVGTransformList

Operator Overloading

TODO

add
mul

builtins

dir
type
hasattr
getattr
setattr
issubclass
isinstance
dict
list
tuple
int
float
str
round
range
sum
len
map
filter
min
max
abs
ord
chr
open (nodejs only)

List

list.append
list.extend
list.remove
list.insert
list.index
list.count
list.pop
list.len
list.contains
list.getitem
list.setitem
list.iter
list.getslice

Set

set.bisect
set.difference
set.intersection
set.issubset

String

str.split
str.splitlines
str.strip
str.startswith
str.endswith
str.join
str.upper
str.lower
str.index
str.find
str.isdigit
str.format
str.getitem
str.len
str.getslice

Dict

dict.copy
dict.clear
dict.has_key
dict.update
dict.items
dict.keys
dict.get
dict.set
dict.pop
dict.values
dict.contains
dict.iter
dict.len
dict.getitem
dict.setitem