var and
val are both used to declare variables in Kotlin language. However, there are some key differences between them:
VAR(Variable)
It is a general variable. The value of a variable that is declared using var can be changed anytime throughout the program. var is also called
mutable and
non-final variable, as there value can be changed anytime.
Example:
Output :
Previous marks is 10
New marks 30
VAL(Value)
The object stored using val cannot be changed, it cannot be reassigned, it is just like the
final keyword in java. val is
immutable. Once assigned the val becomes read-only, however, the properties of a val object could be changed, but the object itself is read-only.
Example 1:
Output:
Val cannot be reassigned
output:
Book(name=Java, price=1000)
Book(name=Kotlin, price=1000)
