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articles/smalltalk.md: add factorial example

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tocariimaa 2025-03-08 20:06:35 -03:00
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@ -61,6 +61,17 @@ String extend [
Transcript show: 'smalltalk' removeVowels; cr. "==> smlltlk" Transcript show: 'smalltalk' removeVowels; cr. "==> smlltlk"
``` ```
### Factorial
Smalltalk already provides a method `factorial` but that's cheating so we will implement it here:
```smalltalk
| n res |
res := 1.
n := 5.
1 to: n do: [:i | res := res * i].
Transcript show: 'fact of ', (n asString), ' = ', (res asString); cr.
```
Homework: add this as a method by extending the `Number` class.
TODO TODO
## Resources ## Resources