Scala

7 flashcards · Programming Languages · by charlie42

1. Difference between defining a function in Scala and in Python

   Scala: def hello(): Unit

2. What does "First class function" refers to

   Programming language is said to have first-class functions if it treats functions as first-class citizens. This means: passing functions as arguments to other functions, returning them as the values from other functions, assigning them to variables, storing them in data structures

3. What's functional programming?

   It's a way to organize code in a way that makes it easier to write and read Make functions behave like mathematical functions First class citizens No side effects Make variables immutable

4. What's an expression in a programming language?

   A sequence of symbols that evaluates to a value (of a type the programming language supports).

5. What are statements in a programming language?

   No formal definition, each language defines a list of what counts as a statement. Generally a piece of instruction to a computer (e.g. variable definition or a loop)

6. What are algebraic data types?

   Data types created by combining other data types using two algebraic operations: sum (union): a value can be ONE of several defined types product: contains ALL specified types at once

7. What's a sealed trait

   A type that can be exactly one of some other types