July 2017
Intermediate to advanced
796 pages
18h 55m
English
Content preview from Scala and Spark for Big Data Analytics
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Type ascription
Type ascription is used to tell the compiler what types you expect out of an expression, from all possible valid types. Consequently, a type is valid if it respects existing constraints, such as variance and type declarations, and it is either one of the types the expression it applies to "is a," or there's a conversion that applies in scope. So, technically, java.lang.String extends java.lang.Object, therefore any String is also an Object. For example:
scala> val s = "Ahmed Shadman" s: String = Ahmed Shadmanscala> val p = s:Object p: Object = Ahmed Shadman scala>
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.