< thatadamedwards> plus is defined as `operator fun lt T gt kotlinlang #getting-started

<@U5ABS5M9A> plus is defined as `operator fun <...

Andreas Sinz

04/19/2018, 7:20 PM

@thatadamedwards plus is defined as

operator fun <T> Set<T>.plus(elements: Iterable<T>): Set<T>

that means it returns a new

Set

that contains"strawberry", it doesn't change the original set. you need to use

operator fun <T> MutableCollection<in T>.plusAssign(element: T)

which changes the original Set

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