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Introduction to type classes in Scala. Upcoming SlideShare. Carlos Morera rated it really liked it Jan 07, James Warren rated it it was amazing Aug 15, Kacper Gunia rated it it was amazing Jun 06, Wojciech Langiewicz rated it it was amazing Jan 05, Ivano rated it really liked it Apr 04, Christian Panadero rated it it was amazing Sep 16, Alexander Shelemin rated it really liked it May 12, Andrey marked it as to-read Oct 01, Pete Garett added it Nov 23, Sergei marked it as to-read Dec 13, Ilya Sterin marked it as to-read Feb 16, Kirill Sukhanov is currently reading it Apr 07, Kiran Babu is currently reading it Oct 15, Pavel marked it as to-read Feb 18, Julio marked it as to-read Jan 18, Carlos R.
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Dimitraka71 marked it as to-read Jan 25, Shams Mali added it Jan 29, Thomas marked it as to-read Feb 13, Alex marked it as to-read Feb 23, Safarione95 added it May 27, Pawel Waclawczyk marked it as to-read Jun 10, Wasif marked it as to-read Jun 20, Shailesh Tikhe marked it as to-read Jul 25, Mani Sarkar marked it as to-read Oct 10, Iulian Dumitru marked it as to-read Oct 11, Maithili Labhe marked it as to-read Oct 14, Alena marked it as to-read Apr 13, Alexander marked it as to-read May 12, Alexander Shtang is currently reading it Jul 11, Remember that singleton and non-singleton objects both have an associated class with a fixed set of methods and fields - it is just that the singleton instances cannot be manually instantiated.
However in match-patterns this is not the case; in fact the dataflow is quite different: Foo.
The fact that Leaf is a singleton instance is not relevant; any object will be treated the same here. Classes Leaf and Nonleaf could be implemented as case-classes, in which case companion-objects would automatically be generated, with unapply methods that look just like the ones above. Note that Leaf.
Scala for Data Science by Pascal Bugnion
When the match-statement executes, it therefore must skip the case-clause if no matching unapply exists. An unapply method often returns values which are similar to, or identical to, the tuple passed to the object constructor.
When an object defines an apply method for use as a factory-method, then often the apply params and unapply return-value are symmetrical.
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