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> If you're used to Java or C++, this object-oriented code may look strange, especially since Smalltalk uses some strange characters. < It's Smalltalk-76 that

by igouy 9y ago

> If you're used to Java or C++, this object-oriented code may look strange, especially since Smalltalk uses some strange characters. < It's Smalltalk-76 that uses some strange characters. The version that made it out of the lab into the wide-world was Smalltalk-80. edited With help from Paolo Bonzini, Smalltalk-80 syntax for that square root code would be something more qwerty-friendly like: sqrt | guess | (self <= 0.0) ifTrue: [ (self = 0.0) ifTrue: [^0.0] ifFalse: [self error: 'sqrt invalid for x < 0.'] ]. guess := self timesTwoPower: self exponent // -2. 5 timesRepeat: [guess := (self - (guess*guess)) / (guess*2.0) + guess]. ^guess "I Can Read C++ and Java But I Can’t Read Smalltalk" pdf http://carfield.com.hk/document/languages/readingSmalltalk.pdf http://carfield.com.hk/document/languages/readingSmalltalk.p...

uytuijhgj 9y ago
From your link: Finally, let’s insist that the separators be part of the method name; i.e., let’s require that the name of the method be “rotate by: around:” and let’s get rid of the spaces to get “rotateby:around:” as the name and finally, let’s capitalize internal words just for readability to get “rotateBy:around:”. Then our example could be written rotateBy: a around: v //This is Smalltalk This is also what Objective-C / Apple does.
- igouy 9y ago
  > This is also what Objective-C / Apple does. Inspired by Smalltalk-80. See "A short history of Objective-C" https://medium.com/chmcore/a-short-history-of-objective-c-aff9d2bde8dd https://medium.com/chmcore/a-short-history-of-objective-c-af...
bonzini 9y ago
The "instfield" line is halving the exponent. In Smalltalk-80 you could write it guess := self timesTwoPower: self exponent // -2. Also, "user notify:" would become "self error:". Modern Smalltalk actually has complete exception handling, so you could also define an exception class (for example ArgumentOutOfRange) and trap it.

by igouy 9y ago

uytuijhgj 9y ago

From your link: Finally, let’s insist that the separators be part of the method name; i.e., let’s require that the name of the method be “rotate by: around:” and let’s get rid of the spaces to get “rotateby:around:” as the name and finally, let’s capitalize internal words just for readability to get “rotateBy:around:”. Then our example could be written rotateBy: a around: v //This is Smalltalk This is also what Objective-C / Apple does.

igouy 9y ago
> This is also what Objective-C / Apple does. Inspired by Smalltalk-80. See "A short history of Objective-C" https://medium.com/chmcore/a-short-history-of-objective-c-aff9d2bde8dd https://medium.com/chmcore/a-short-history-of-objective-c-af...

bonzini 9y ago

The "instfield" line is halving the exponent. In Smalltalk-80 you could write it guess := self timesTwoPower: self exponent // -2. Also, "user notify:" would become "self error:". Modern Smalltalk actually has complete exception handling, so you could also define an exception class (for example ArgumentOutOfRange) and trap it.