Kotlin lazy functions

Using lazy in Kotlin

When we have to define a variable that will be later initialized as done below. 

fun main() {
   
    var lazyValue: Int? = null
   
    fun getlazyValue(): Int?{
    if(lazyValue == null){
        lazyValue = 45
        
    }  
        return lazyValue!!
    
}
}

**Better way** 

fun main() {

  val lazyValue by lazy {45}
}

* The variable won't get initiliazed untill someone uses it for fist time. 
* Here kotlin use property delegates that delegates the logic to somewhere else which run a logic to return 
  the variable. 
[Property Delegate Ref](https://medium.com/rocket-fuel/kotlin-by-property-delegation-create-reusable-code-f2bc2253e227)