init(block:arguments:)

Creates an expression object that uses the block for evaluating objects.

Declaration

init(block: @escaping (Any?, [NSExpression], NSMutableDictionary?) -> Any, arguments: [NSExpression]?)

block:
The Block is applied to the object to be evaluated.
The Block takes three arguments and returns a value:
evaluatedObject
The object to be evaluated.
expressions
An array of predicate expressions that evaluates to a collection.
context
A dictionary that the expression can use to store temporary state for one predicate evaluation.
Note that context is mutable, and that it can only be accessed during the evaluation of the expression. You must not attempt to retain it for use elsewhere. ]
The Block returns the evaluatedObject.
arguments:
An array containing NSExpression objects that will be used as parameters during the invocation of selector.
For a selector taking no parameters, the array should be empty. For a selector taking one or more parameters, the array should contain one NSExpression object which will evaluate to an instance of the appropriate type for each parameter.
If there is a mismatch between the number of parameters expected and the number you provide during evaluation, an exception may be raised or missing parameters may simply be replaced by nil (which occurs depends on how many parameters are provided, and whether you have over- or underflow).
See Init(forfunction:arguments:) for a complete list of arguments.

An expression that filters a collection using the specified Block.