add All What If Not Null
inline fun <T : MutableCollection<E>, E> T.addAllWhatIfNotNull(element: Collection<E>?, whatIf: (T) -> Unit): T
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An expression for adding an element and invoking whatIf when the element is not null.
Return
Returns the original target object.
Parameters
element
n collection of elements should be added into the target.
whatIf
An executable lambda function if the element it not null.