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12: Q92 – Q97 Hadoop file formats and how to choose

Q92. What are the criteria for choosing storage file formats in Hadoop? A92. Choosing the wrong file formats can significantly increase the query times and storage spaces. Choosing a format that does not support flexible schema evolution may cost massive re-processing just to add a new field. Here the key…...

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18: Q104 – Q108 Scala typeclass pattern for decoupling with polymorphism

Q104. What is the importance of “typeclass” pattern in Scala? A104. Typeclass pattern is to achieve decoupling via adhoc polymorphism. Polymorphism separates interfaces from implementations, to decouple what from how. Polymorphism improves code readability with better code organization. It promotes creation of extensible programs that can be “grown” not only…...

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17: Q99 – Q103 Scala applicatives & scalaz interview Q&As

This extends Scala Functors Interview Q&As & Scala monads interview Q&As. You need to remember the following.

Q99. Why do you need an applicative functor? A99. The “map” method in the functor works with a single input argument as explained in the Scala functors interview Q&As. What if…...

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01B: ♦ 40+ Java Microservices & Web services Interview Q&As – Q07 – Q12

Extends Java Web Services Basics Interview Q&As – Q17 – Q06. Q7. What is a microservice architecture (aka MSA)? A7. Martin Fowler defines Microservices as a subset of Service Oriented Architecture (SOA). In SOA, the services can be of any size. In a microservice, the service performs a single function.…...

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14: Q84 – Q87 Category Theory With Scala Interview Q&As

Q84. What is a category theory from a functional programming language perspective? A84. The category theory is all about abstractions. Composition “f” and “g” are functions, and “A” and “B” are types. f: A => B, means the function “f” takes an input of type “A” and returns an output…...

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16: Q93 – Q98 Scala monads interview Q&As

This extends Scala Functors Interview Q&As. You need to remember the following.

Q93. What is a monad? A93. Monad is a wrapper (or a context) that flattens the result so that it can be further processed by mapping over each element. Everything that’s a monad is a functor…...

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15: Q88 – Q92 Scala Functors Interview Q&As

This extends Category Theory With Scala Interview Q&As. Q88. What do you understand by the terms functors, monads, and applicatives ? A88. Functors, Monads, and Applicatives are concepts or patterns that abstract complexities in computations, and are NOT traits or classes. You can think of them as container type classes…...

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09: Coding Scala Way – Fibonacci Series

Example #22: Fibonacci series in Scala This extends determine the nth fibonacci number using Scala. In this let’s print the Fibonacci series of length n. This post is motivated by a nice post at Fibonacci Numbers in Scala.

Q1 Is the above approach to “print the Fibonacci series of…...

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