What
Is Smalltalk?
Smalltalk
is pure object oriented programming (OOPs), dynamically typed and reflective
programming language.
Smalltalk
is an improvement environment – class browsers, debugger, inspector and refactoring
engine.
Everything
is an object –variables, constants, activation
records and classes.
Smalltalk
was designed and created by Learning Research Group of Xerox PARC in 1972 and the
Researcher Team –
ü Alan
Kay
ü Dan
Ingalls
ü Adele
Goldberg
ü Ted
Kaehler
ü Scott
Wallace
ü And
so on
All computation is performed by objects sending
and receiving messages – 1+2*3
What
Types of characters Allowable in Smalltalk?
ü 0-9
ü A-Z
ü a-z
ü .+/*~<>@%|&?
ü blank,
tab, cr, ff, lf
ü And
so on
How
To Declare Variables in Smalltalk?
ü Variables
must be declared before use
ü Shared
variables must begin with uppercase
ü Local
variables must begin with lowercase
ü Reserved
names - true, false, nil, self and super
What
Is the Variable scope in Smalltalk?
ü Global
ü Class
ü Class
Instance
ü Pool
ü Block
Temporary
ü Method
Temporary
ü Method
Parameters
ü Instance
Variables
References links–
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