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Python and Smalltalk
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Notes about Smalltalk. Smalltalk influenced essentially all of the subsequent object-oriented languages. A few of the modern Smalltalk frameworks include Amber and Seaside which are geared toward web development. | |
"this is a comment in Smalltalk. we are going to declare and assign variables." | |
| x y | "declare the variable x and y" | |
x := 1 "assign x a value of 1" | |
y:= $q "assign y the character 'q'" | |
# this is a comment in Python. we are going to declare and assign variables. | |
x = 1 # declare and assign x a value of 1 | |
y = 'q' # declare and assign y a value of 'q' | |
******** | |
"printing to the screen in Smalltalk" | |
Transcript show: 'Hello World'. | |
# printing to the screen in Python | |
print('Hello World') | |
******** | |
"conditional statements in Smalltalk" | |
x > 1 | |
ifTrue: [Transcript show: 'x is greater than 1'.] | |
ifFalse: [Transcript show: 'x is less than or equal to 1'.] | |
# conditional statements in Python | |
if x > 1: | |
print('x is greater than 1') | |
else: | |
print('x is less than or equal to 1') | |
******** | |
"looping in Smalltalk" | |
| x | | |
x := 10 | |
x timesRepeat: [Transcript show: 'this is an iteration'.] | |
1 to: x do: [Transcript show: 'this is an iteration'.] | |
[x > 5] whileTrue: [x := x + 1. Transcript show: 'this is an iteration'.] | |
# looping in Python | |
x = 10 | |
# note: off the top of my head, I don't recall if Python has an equivalent to timesRepeat method in the looping sense. | |
while x != 0: | |
print('this is an iteration') | |
x-- | |
******** | |
# arrays and collections in Smalltalk | |
| myArray x | | |
myArray := #(1 2 3 $a $b $c). | |
x := myArray at: 4 | |
"array indices in Smalltalk begin at 1. the above statement yields $a | |
# arrays and collections in Python | |
myList = [1, 2, 3, 'a', 'b', 'c'] | |
x = myList[3] | |
# list indices in Python begin at 0. the above statement yields 'a' |
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