Class KeepsUnsetIntoList

java.lang.Object
org.ek9lang.compiler.support.streams.KeepsUnsetIntoList
All Implemented Interfaces:
BiPredicate<ISymbol,ISymbol>
public final class KeepsUnsetIntoList extends Object implements BiPredicate<ISymbol,ISymbol>
True when a TERMINAL's target is a List (the built-in, any parameterisation): collect as List of X, > list, >> list and a tee ... in list target append each element with the List's += (_addAss), which keeps an unset element, never with its | (_pipe), which drops it (Steve, 2026-10-21: "keep them through +="). THE one test - a fold (> total), a Set, a Dict, an Optional, a user type, a StringOutput or a file are NOT Lists and keep their own |. Never a second "is this a List target" test. The first argument is the built-in List symbol (Ek9Types.ek9List()), the second the type of the terminal's receiver.