Kotlin Variables

There are two types of declaration in Kotlin.
1. val - once declared it cannot be changed.
2. var - once declared it can be changed.

val syntax is:

val varname: Datatype = value

var syntax is:

var varname = value

or we can also specify a datatype.

var varname: Datatype = value

Let us look at some examples.

1. Declaration of an integer val.

val a: Int = 3

You need not declare the data type.
Kotlin can infer the data type based on what it sees on right hand side.

2. Example for non declaration.

val a = 1

If you are not initializing, but only declaring, you must provide the type.

val a: Int

You must provide type in above scenario as Kotlin cannot infer.