Question - Why would you use apply in Kotlin?
Answer -
Look at this code:
person.name = "Tony Stark"
person.age = 52
and equivalent with apply will be:
val person = Person().apply {
name = "Tony Stark" // this. can be omitted
age = 52 // this. can be omitted
// ...
}
This way you don't have to repeat person several times. Apply is used to keep things that belong together in one place (mostly initializations).