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Questions - immutability

Why do we need constants in Rust if we have immutable variables?

So I'm exploring Rust, and I have read about technical differences between constants and immutable variables. But it seems like immutable variables can do all things that constants can. Then what is t...
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Oleksandr Novik

variables

rust

constants

immutability

Votes: 0

Answers: 3

Latest Answer

There are two computational times that you should take into account: compilation time run time The constant is computed at compilation time (and can be used in other compile-time computation) and he...
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Nathan

TypeScript immutable data/classes with mutual reference

Usually when I create a TypeScript application I follow an OOP + immutable data philosophy. So let's suppose I have two classes with mutual reference, class A and class B. class A { public readonl...
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Vasile Alexandru Peşte

javascript

typescript

class

immutability

readonly

Votes: 0

Answers: 1

Latest Answer

One way is use getter to achieve lazy evaluation, class A { private readonly _item: () => B; public get item(): B { return this._item(); } public constructor(_item: () => B) { t...
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ABOS

Console assigns different IDs to identical immutable objects

I'm using Python 3.10.1. When I run the following code as a .py file, it prints True: a = (1, 2) b = (1, 2) print(a is b) However, when I type the same lines of code into the interactive Python conso...
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Ron Inbar

python

tuples

immutability

Votes: 0

Answers: 1

Latest Answer

From document: A Python program is constructed from code blocks. A block is a piece of Python program text that is executed as a unit. The following are blocks: a module, a function body, and a class...
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S.B

Why lower bound(<? super T>) is mutable and upper bound not (<? extends T>) in Java

I'm trying to understand Java Generic so I ended up with not able to understand why lower bound type can be mutable and upper bound types not. The example I have: List<? extends String> upperBou...
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Ahmad Alhaj-Karim

java

generics

immutability

mutable

Votes: 0

Answers: 0

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