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immutability    
n. 不变,不变性

不变,不变性

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  • 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
  • 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 are integers immutable in Python? - Stack Overflow
    Assuming immutability of some types enables all sorts of optimizations Those optimizations are most pronounced for str, but they come into play for int, float, tuple, frozenset too Some would probably argue that immutability makes the code easier to read in lots of situations too
  • immutability - What does immutable and readonly mean in C#? - Stack . . .
    Immutability is a property of the object itself These can be freely combined To make sure that a property is not changed in any way, it should be a readonly reference to an immutable object
  • 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
  • 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 - What is the difference between stateless and immutable . . .
    I often hear the term "Stateless" and "Immutable" For example, HTTP is a stateless protocol, and a String object is an immutable object But I have a hard time grasping the difference between the





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