25 Jul 2019
In the generic types, the variance is the correlation between the inheritance relation of the abstract types and how it is “transmitted” to the inheritance in the generic classes. Scala supports variance annotations of type parameters of generic classes, to allow them to be covariant, contravariant, or invariant.
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24 Jul 2019
Apache Spark is a library that let you write code, that will be executed in a distributed fashion, as a simple single-threaded program. Spark will make the dirty job for you: it will distribute the code and the execution, manage remote objects for you, optimize the algorithm for you.
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Gurdit Singh