Lazy Initialization

For efficient memory management, Kotlin has introduced a new feature called Lazy initialization.

When the lazy keyword is used, the object will be created only when it is called, otherwise, there will be no object creation. lazy() is a function that takes a lambda and returns an instance of lazy which can serve as a delegate of lazy properties upon which it has been applied. 

It has been designed to prevent the unnecessary initialization of objects.

• Lazy can be used only with non-NULLable variables.
• Variable can only be val. "var" is not allowed.
• Object will be initialized only once. Thereafter, you receive the value from the cache memory.
• The object will not be initialized until it has been used in the application.

class Demo {
   val myName: String by lazy {
      println("Welcome to Lazy declaration");
   }
}

fun main() {
   var obj=Demo();
   
   println(obj.myName);
   println("Second time call to the same object--"+obj.myName);
}