var vs def

Hello All,

I am a newbie to scala and getting in grasp with val and def.

I noticed that I could write :

scala> var greatWorld2 = println("great world")

great world

greatWorld2: Unit = ()


AND


scala> def greatWorld() = println("great world")

greatWorld: ()Unit


Can someone please help me understand the difference?


I am aware that var is generally used to define variables and def is used 
to define functions. 


Now, keeping in mind that greatWorld2 is actually a variable and not a 
function, I am trying to print it, and I get:


scala> greatWorld2


OR, if I try calling it as a function, it throws an error e.g. below (which 
sounds ok as I did not declare this as a function, so was expecting this 
anyway).


scala> greatWorld2()

<console>:9: error: Unit does not take parameters

              greatWorld2()



 Long story short, difference between var and def , in terms of what the 
interpreter and or compiler is doing underneath will be very good to 
understand.


Thanks Guys,

S



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