What is immutability and why should I worry about it? Immutability is applied primarily to objects (strings, arrays, a custom Animal class) Typically, if there is an immutable version of a class, a mutable version is also available For instance, Objective-C and Cocoa define both an NSString class (immutable) and an NSMutableString class
Pros. Cons. of Immutability vs. Mutability - Stack Overflow Immutability has, for example, benefits in muti-threaded programs As immutable objects cannot change their state after construction, you can safe share them across any number of concurrently running threads, without the risk of one interfering (by altering the state of an object visible to other threads) with another
oop - Mutable vs immutable objects - Stack Overflow One of the finer points in the debate over mutable vs immutable objects is the possibility of extending the concept of immutability to collections An immutable object is an object that often represents a single logical structure of data (for example an immutable string)
java - What is meant by immutable? - Stack Overflow What is necessary is not that the fields be immutable, but rather that the object's defined observable state be immutable; an object which holds a reference to another object as a means of encapsulating state contained therein can only be immutable if all encapsulated aspects of state which it exposes to the outside world are likewise immutable
immutability - Why would one declare an immutable class final in Java . . . Immutability also affects more than just a single method — it affects the entire instance — but this isn't really much different than the way equals and hashCode in Java work Those two methods have a specific contract laid out in Object This contract very carefully lays out things that these methods cannot do This contract is made more
immutability - How to create immutable objects in Java . . . - Stack Overflow still does not ensure complete immutability since the following is still valid from the class MutabilityCheck: iMC getMutClass() setName("Blaa"); However, running MutabilityCheck with the changes made in 1 will result in the output being: Foo Foo In order to achieve complete immutability on an object, all its dependent objects must also be
immutability - Which of these are immutable in Python? - Stack Overflow Immutability is an important concept, since knowing that an object's value can't change lets you make certain assumptions about it (for example, dict effectively requires immutable keys and set and frozenset require immutable members, as the value of an object affects how it should be stored in the data structure If mutable entries were