Q1. What is a pure function?
A1. A pure function is a function where the following conditions are met:
1) The Input solely determines the output.
2) The function does not change its input.
3) The function does not do anything else except computing the output.
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This extends Scala Functional Programming basics – pure functions, referential transparency, side effects, etc.
Q1. What is a first-class function?
A1. A first-class function is a function that can be treated like a value.
1) Can be assigned to a variable as a value can be assigned to a variable.
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100+ FAQ Scala interview questions answered with code. Learn more about FP – 6 tips to transforming your thinking from OOP/imperative programming to functional programming (i.e. FP). Scala is very popular in Apache Spark programming to process Big Data. 70+ FAQ Bigdata & Hadoop interview questions &
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Let’s see how we can wire up functions with & without currying, and then touch on functional composition.
Without currying
Here are simple functions example that add, add10, multiply and multiplyBy10 without currying.
Output:
With currying & partial application with functional composition
Note: You can also do
Output:
What is Currying?…
This extends Q1 – Q5 Scala Functional Programming basics interview questions & answers Q6. What is a curried function in Scala? A6. Currying is the technique of transforming a function with multiple arguments into a function with just one argument, … Read more ›...
Q13. What are the different approaches in Scala to solve the following task?
Given numbers 1 to 6, and you need to extract out the odd numbers and double them, and finally print the result.
A13. There are 3 ways to solve the problem.
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Java has idioms like Try-Catch-Finally, Scala has idioms like 1) “Option-Some-None”, 2) Either-Left-Right 3) Try-Success-Failure. Q27. How does Scala try to solve the problem of getting rid of null values & the “NullPointerException”? A27. Scala provides its own type for representing optional values with “Option[A]”, … Read more ›...
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