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sortBy

inline fun <T, R : Comparable<R>> MutableList<T>.sortBy(
    crossinline selector: (T) -> R?)

Sorts elements in the list in-place according to natural sort order of the value returned by specified selector function.

inline fun <T, R : Comparable<R>> Array<out T>.sortBy(
    crossinline selector: (T) -> R?)

Sorts elements in the array in-place according to natural sort order of the value returned by specified selector function.

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/sort-by.html