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/*

 Create a POJO with getters, setters, `equals()`, `hashCode()`, `toString()` and `copy()` in a single line:

*/

​

data class Customer(val name: String, val email: String, val company: String)

​

// Or filter a list using a lambda expression:

​

val positiveNumbers = list.filter { it > 0 }

​

// Want a singleton? Create an object:

​

object ThisIsASingleton {

    val companyName: String = "JetBrains"

}