minusElement

Returns a list containing all elements of the original collection without the first occurrence of the given element.

inline fun <T> Iterable<T>.minusElement(element: T): List<T>(source)

val numbers = listOf(1, 2, 3, 2, 4)
val withoutFirstTwo = numbers.minusElement(2)   // removes the first 2
println(withoutFirstTwo)   // [1, 3, 2, 4]

Source