What is the difference between Expressions and Statements in Scala

Question

I'm new in Scala world and want to know what is the difference between Expressions and Statements and Why if-else is used for expression, not statements. And if there is a way to use statement in if-else?

Answer 1

Everything in Scala is an Expression!

Theory:

• Instructions/Statements are executed in imperative languages like Java but Expressions are evaluated in Functional languages(Declarative programming) like Scala.
• Instruction means Do something for me but Expression means give me the Value of something.

Practical:

If else expression:

val aCondition = true
val aConditionValue = if(aCondition) 4 else 2
println(aConditionValue) 

To prove this we can just use this Expression in println directly

println(if(aCondition) 4 else 2)

Note: Here If else expression is giving the value instead of setting/doing something based on condition.