Category:Smalltalk: Difference between revisions
Content added Content deleted
| Line 93: | Line 93: | ||
== Examples == |
== Examples == |
||
As smalltalk code seems to be hard to read for programmers with a C background, some examples are provided here: |
As smalltalk code seems to be hard to read for programmers with a C background, some examples are provided here: |
||
=== Literals == |
|||
<lang smalltalk> |
<lang smalltalk> |
||
"a comment - everything in between double quotes" |
"a comment - everything in between double quotes" |
||
"/ an end-of-line comment (dialect specific) |
"/ an end-of-line comment (dialect specific) |
||
| ⚫ | |||
| ⚫ | |||
1234 "integer constant; an instance of Integer" |
1234 "integer constant; an instance of Integer" |
||
| Line 105: | Line 110: | ||
1.234 "float constant; an instance of Float" |
1.234 "float constant; an instance of Float" |
||
| ⚫ | |||
| ⚫ | |||
| ⚫ | |||
| ⚫ | |||
| ⚫ | |||
(1/7) "fraction constant; an instance of Fraction" |
(1/7) "fraction constant; an instance of Fraction" |
||
123s3 "fixed point constant with precision (somewhat dialect specific) |
123s3 "fixed point constant with precision (somewhat dialect specific) |
||
| ⚫ | |||
| ⚫ | |||
#(1 true $a 16rFF 1.0 (10 20)) "array literal constant; the last element being another array; an instance of Array" |
#(1 true $a 16rFF 1.0 (10 20)) "array literal constant; the last element being another array; an instance of Array" |
||
#[ 10 20 2r1000 16rFE ] "byte-array literal constant; an instance of ByteArray" |
#[ 10 20 2r1000 16rFE ] "byte-array literal constant; an instance of ByteArray" |
||
| ⚫ | |||
[ ... some code ... ] "a block literal; an instance of BlockClosure (dialect specific); the object represents the piece of code which can be passed around and evaluated later (a lambda closure)" |
[ ... some code ... ] "a block literal; an instance of BlockClosure (dialect specific); the object represents the piece of code which can be passed around and evaluated later (a lambda closure)" |
||
[:a1 ... :aN | ... some code ...] "a block literal with arguments." |
[:a1 ... :aN | ... some code ...] "a block literal with arguments." |
||
</lang> |
|||
===Message Sends=== |
|||
<lang smalltalk> |
|||
1000 factorial "send the 'factorial' message to the integer receiver" |
1000 factorial "send the 'factorial' message to the integer receiver" |
||
| Line 145: | Line 149: | ||
... |
... |
||
b value "evaluate the block's code" |
b value "evaluate the block's code" |
||
</lang> |
|||
=== Other === |
|||
<lang smalltalk> |
|||
foo := bar "assignment; let foo refer to the object to which bar refers to (at that particular point in time)" |
foo := bar "assignment; let foo refer to the object to which bar refers to (at that particular point in time)" |
||
^ a + 1 "return the value of the 'a+1' message send as the |
^ a + 1 "return; the value of the 'a+1' message send is returned as the value of the current method invocation." |
||
'hello' print. 'world' print "statements are separated by a period; just like in english" |
'hello' print. 'world' print "statements are separated by a period; just like in english" |
||
|a b c| "local variables; introduces 'a', 'b' and 'c' in the current scope (let-like local bindings)" |
|||
</lang> |
</lang> |
||