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
2009年12月7日 · 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.
immutability - What does immutable and readonly mean in C
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.
java - What is meant by immutable? - Stack Overflow
2008年11月11日 · 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 - What does "immutable variable" mean in functional ...
I'm new to functional programming, and I don't understand the concept of immutability; e.g. an immutable variable. For example, in Standard ML (SML): val a = 3 val a = a + 1 The second line does n...
Why do immutable objects enable functional programming?
2012年8月31日 · Now exactly the same story goes about "immutability" as well, if objects are not immutable, a function with the same object as its input may have different results (aka side effects) each time used, and this will make it hard to reason about the program.
immutability - How to make an immutable object in Python
One thing that's not really included here is total immutability... not just the parent object, but all the children as well. tuples/frozensets may be immutable for instance, but the objects that it's part of may not be. Here's a small (incomplete) version that does a decent job of enforcing immutability all the way down:
Why is immutability so important (or needed) in JavaScript?
2015年12月21日 · 1) Immutability is awesome for avoiding race conditions in multi-threaded environments. Multi-threaded environments (like C++, Java and C#) are guilty of the practice of locking objects when more than one thread wants to change them.
immutability - Ways to make a class immutable in Python - Stack …
2011年2月14日 · The main approaches for archive immutability: use immutable structures, e.g. tuple, frozenset, use ...
immutability - Check for mutability in Python? - Stack Overflow
2010年12月8日 · There isn't actually any such thing as mutability or immutability at the language level in Python. Some objects provide no way to change them (eg. strings and tuples), and so are effectively immutable, but it's purely conceptual; there's no property at the language level indicating this, neither to your code nor to Python itself.