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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
  • 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
  • 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)
  • 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 - 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
  • java - Why do we need immutable class? - Stack Overflow
    Immutability simply means that a certain class of objects are constants, and we can treat them as constants (Of course the user could assign a different "constant object" to a variable Someone can write String s="hello"; and then later write s="goodbye"; Unless I make the variable final, I can't be sure that it's not being changed within my
  • javascript - What does immutable mean? - Stack Overflow
    On a lower level, immutability means that the memory the string is stored in will not be modified Once you create a string "foo", some memory is allocated to store the value "foo" This memory will not be altered If you modify the string with, say, substr(1), a new string is created and a different part of memory is allocated which will store
  • 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





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