Calls a predicate for each item in a list, rejects any items for which the returned value is true, and returns all remaining items.
reject( predicate, list, [context, … ] )
predicate: (Function, Rule, or Data Type Constructor) Expression that returns a Boolean (true or false).
list: (Any Type Array) List of elements that the predicate iterates through.
context: (Any Type Array) Variable number of parameters passed directly into each function evaluation.
Any Type Array
Use fn!functionName to reference an expression function and rule!ruleName to reference a rule.
a!forEach() cannot be used within rules used in this function.
reject(fn!isnull, {1, null(), 3}) returns 1, 3
