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Questions - pattern-matching

Better solutions to long pattern matching chains (for Dart)

I've often found myself having to use annoying patterns like: ClassA extends BaseClass { static bool is(val) { ... } } ClassB extends BaseClass { static bool is(val) { ... } } ... ClassZ extends B...
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user3210986

dart

pattern-matching

Votes: 0

Answers: 3

Latest Answer

If you want to cut down the arbitrary conditionals in the BaseClass.parser(), you can use a map as follows: typedef Specification = bool Function(dynamic val); typedef Factory = BaseClass Function(dyn...
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saw

DrRacket: Desurgaring all uses of and, or, not into nested ifs

So I am currently learning how to program and we started with DrRacket. This week the task consists of using pattern matching and working/translating expressions into s-expressions and vice versa. I w...
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user17949498

pattern-matching

racket

s-expression

Votes: 0

Answers: 1

Latest Answer

The trick is to think about what it is that things like and and or need to turn into if all you have is if. not is really too simple to talk about, so I won't. and is reasonably easy and divides into ...
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ignis volens

How to save an object unknown at compile time to a variable by pattern matching in Rust?

TLDR; How do you make Rust's pattern matching behave dynamically like Python 3? I'm quite new to Rust, and I struggle with a certain concept / code snippet. I'm trying to assign an object that is unkn...
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user17941677

rust

pattern-matching

Votes: 0

Answers: 2

Latest Answer

You can dynamically dispatch them,remember that for that you need to box your types: let object: Box<dyn DoAction> = match condition { true => Box::new(ObjectA { ... }), false => B...
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Netwave

What family of algorithms should I look at to extract words from a sentence

I am building a basic workout logger that would save and display some statistics about your number of repetitions per movement over a period of time. The challenge here (for me at least) is that I wan...
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Remaori

string

algorithm

pattern-matching

Votes: 0

Answers: 0

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