Reference
A reference value points to a sequence of memory locations that may contain an object or array.
Related concepts: ValueTypeObjectArrayPrimitive
Closest Wikipedia entry: Reference (computer science)
Misconceptions about Reference28 documented Misconceptions
Check YourselfAssignmentCopiesObject — Java
Assignment copies the objectEqualityOperatorComparesObjectsValues — Java
o==p compares the objects referred to by variables o and pEqualsComparesReferences — Java
o.equals(p) compares the references stored in the variables o and pFinalReferenceImpliesImmutability — Java
An object referred to by a final variable is an immutable objectMultiReferenceVariable — Java
A reference variable can point to multiple objectsNullIsObject — Java
null is an objectReferenceIntoStack — Java
References can point into the stackReferenceToBooleanCoercion — Java
Every reference type can be coerced to booleanReferenceToIntegerConversion — Java
One can cast between references and intsReferenceToVariable — Java
References can point to variablesSubtypeCompatibleWithSupertype — Java
A variable of a subtype can reference an object of a supertypeSupertypeIncompatibleWithSubtype — Java
A variable of a supertype cannot reference an object of a subtypeThisAsField — Java
this is a special field in the objectThisAssignable — Java
One can assign to thisThisCanBeNull — Java
this can be nullThisExistsInStaticMethod — Java
this is a local variable, also in static methodsThisInConstructorIsNull — Java
In a constructor, this is nullVariablesHoldObjects — Java
A variable of a reference type contains a whole objectAssignmentCopiesObject — JavaScript
Assignment copies the objectConstReferenceImpliesImmutability — JavaScript
An object referred to by a const variable is an immutable objectEqualityOperatorComparesObjectsValues — JavaScript
The equality operator compares two objects' valuesNullIsObject — JavaScript
null is an objectObjectAsParameterIsCopied — JavaScript
Objects are passed by valueThisAssignable — JavaScript
One can assign to thisAssignmentCopiesObject — Python
Assignment copies the objectSelfAssignable — Python
Reassigning self changes the object on which a method is calledVariablesHoldObjects — Python
A variable contains a whole objectEqualityOperatorComparesListIdentities — Scratch
(list a) = (list b) compares the identities of list a and list b