gistfile1.txt

\ A backslash outside a string is a comment 
¥ The Yen sign can also be used (See Japanese keyboard layouts to understand why)

\ Keywords
yes
no
nil
self
super

\ Variable assignment
a = b \ Variables are local in scope
      \ Variables must begin with a lowercase letter, as uppercase names
      \ are reserved for classes

\ Arrays & Dictionaries
anArray = #[ a, b, c ] \ Initialises an array containing 3 elements
aDict  = #{ key = value, anotherKey = value } \ Initializes a dictionary

\ Blocks

aBlock = { ..body.. } \ A block. Defines scope
aBlockWith = { arg0, arg1 | ..body.. } \ A block that takes two arguments
aBlock = { &arg |  ..body.. } \ Prefixing an argument with & indicates that rather than evaluating it,
                               \ a block with it as it's body should be passed
aBlock = { arg=123 |  ..body.. } \ Assignment in the argument list indicates a default value
                                  \ for that argument


\ Block calls

aBlock()                            \ Calls a block with no arguments
aBlock(something, somethingElse) \ Calls a block with a two arguments

\ Objects

#Klass < Object {
    + new {               \ Class method
        self = super new. \ Calls superclass method
        self#ivar = 123   \ Sets instance variable
        return: self.
    }
    - aMethod: a and: b { \ Instance method taking two arguments
        #ivar = a + b     \ Shorthand for self#ivar
    }
}

\ Passing messages to objects
instance = Klass new
instance aMethod: 123 and: 456
instance aMethod: 123. \ To explicitly terminate a message you use a period

\ Accessing member variables
obj#member = 123
a = obj#member