The method below demonstrates how to use the firstOrNull() method. If no element matches the given predicate function, then null is returned. In Kotlin, the Elvis operator returns its left-hand. This method returns the first element from the list that satisfies the provided the predicate. The Fantom programming language has the : binary operator that compares its first operand with null. This method takes a predicate function as an argument. Syntax to get the first element that matches the predicate fun List.firstOrNull( Returns the first element if the ArrayList is not empty. Syntax to get the first element // to get first element

If no element matches the provided predicate function, then null is returned. To get the first element of the ArrayList that satisfies the provided predicate function Predicate is a Functional interface, which takes one argument and returns either true or false based on the condition defined.This is why it is so important to know how to properly use it. This characteristic undoubtedly represents one of the coolest, most beautiful, and innovative features coming with the Kotlin programming language. If the ArrayList is empty, then null is returned. Kotlin supports this possibility since its first release, and it is called null safety. To get the first element of the ArrayList.The firstOrNull() method can be used in two ways.

Kotlin is null