Pharo Smalltalk syntax Cheat Sheet

startPoint	a variable name
Transcript	a global variable
self, super, nil, true, true, false, thisContext	pseudo variable
1	decimal integer
2r101	binary integer
1.5	floating point number
2.4e7	number in exponential notation
$a	the character 'a'
'Hello'	the string 'Hello'
#Hello	the symbol #Hello
#(1 2 3)	a literal array
{ 1 . 2 . 3 . 4 }	a dynamic array
"a comment"	comment
\| x y \|	declaration of variable x and y
x := 1	assign 1 to x
[ :x \| x + 2 ]	a block that evaluates to x + 2
<primitive: 1>	a method annotation
3 factorial	unary message factorial
3 + 4	binary message +
2 raiseTo: 6 modulo: 10	keyword message raiseTo:modulo:
^ true	return the value true

Parentheses > Unary message > Binary message > Keyword message

OrderedCollection new
  add: 1;
  add: 2;

Mesages separated by semi-colon;

condition
  ifTrue: [ block when condition is true ]
  ifFalse: [ block when condition is false ]

(1 to: 10) do: [ :i \| Transcript crShow: i ].	Loop with block execution
arr collect: [ :i \| i * 2 ].	Transform elements to get new collection
arr select: [:i \| i % 2 == 0 ].	Get only elements passed the test
arr detect: [:i \| i > 5 ] ifNone: [].	Find the first element passed the test
[ x < 10] whileTrue: [ x := x + 1].	Loop until test condition is passed

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Pharo Smalltalk syntax Cheat Sheet (DRAFT) by anhduc.nguyen