A ‘for’ comprehension clause, also known as a quantifier clause.

A ‘for’ comprehension clause consists of the keyword ‘for’, an iterator and a following clause.


for (person in people) "``person.firstName`` ``person.lastName``"
for (people in peoples) for (person in people) if (person.age >= 18) person

no subtypes hierarchy

ForComprehensionClause(ForIterator iterator, ComprehensionClause clause)
  • iterator

    The iterator of the comprehension clause.

  • clause

    The following / next / inner comprehension clause.

childrenSource Codeshared actual [ForIterator, ComprehensionClause] children

The child nodes of this node.

clauseSource Codeshared actual ComprehensionClause clause

The following / next / inner comprehension clause.

hashSource Codeshared actual Integer hash

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

  • if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

Refines Object.hash
iteratorSource Codeshared ForIterator iterator

The iterator of the comprehension clause.

Inherited Attributes
Attributes inherited from: Node
Attributes inherited from: Object
copySource Codeshared ForComprehensionClause copy(ForIterator iterator = ..., ComprehensionClause clause = ...)
  • iterator = this.iterator
  • clause = this.clause
equalsSource Codeshared actual Boolean equals(Object that)

Determine if two values are equal. Implementations should respect the constraints that:

  • if x===y then x==y (reflexivity),
  • if x==y then y==x (symmetry),
  • if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

transformSource Codeshared actual Result transform<out Result>(Transformer<Result> transformer)

Transform this node with the given transformer by calling the appropriate transformX method on the transformer.

If you have a Node node that’s actually an LIdentifier instance, then the runtime will call LIdentifier.transform; therefore, this method is by nature narrowing. This means that if transformer is a NarrowingTransformer, calling node.transform(transformer) is equivalent to calling transformer.transformNode(node). On the other hand, if transformer is a WideningTransformer, then the two operations are very different.

Inherited Methods
Methods inherited from: Node