add

kotlin-stdlib / kotlin.collections / MutableList / add
Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
abstract fun add(element: E): Boolean

Adds the specified element to the end of this list.

Return true because the list is always modified as the result of this operation.

Platform and version requirements: JVM (1.0), JS (1.0), Native (1.0) 
abstract fun add(index: Int, element: E)

Inserts an element into the list at the specified index.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/add.html