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Questions tagged [pattern-matching]

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Finding sequences of data that have a particular structure or matching specific criteria or rules. For character pattern defined by a regular expression, use the tag regular-expressions instead.

36 questions
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2 votes
5 answers
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In an HTTP application, I think about routing requests based not only on the path, but also based on the request body. For an example, think about the following two different body schemas for a PUT ...
Jonathan Herrera's user avatar
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0 votes
1 answer
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In my application I have requests and items, each of which are associated with property tuples (key value pairs, where keys can be repeated) stored in a Postgres database. The goal is to find a single ...
flakes's user avatar
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1 answer
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C#10 Has extended the property pattern ability, I think it began since #7 EG: { Car: { Interior: pattern } } Meaning you can do some nice pattern matching even in if statements if (car_var is ...
Pogrindis's user avatar
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5 votes
4 answers
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I've often come across situations where pattern matching in a string is formalized, but the reverse is not. Say I invent a new string pattern that can be expressed by regex /([0-9a-z])*:([0-9a-z])*@([...
Jonathan Allard's user avatar
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2 votes
2 answers
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I'm developing backend for a dating app, in which each user has a profile of his/her characteristics a profile of ideal match's characteristics There are dozens of characteristics like gender, ...
Babr's user avatar
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2 votes
2 answers
396 views

I have a situation where I need to model objects that don't share common attributes but represent same logical entity. Now, based on their type they will have different attributes (properties). To ...
Michael's user avatar
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1 vote
1 answer
63 views

I'm retrieving values from 3 tables in database and trying to make them match. I was wondering how I could manage cache in an elegant way. I can't change the database structure even though one of the ...
FooBar's user avatar
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2 votes
1 answer
156 views

I've been trying to design a backend architecture to a SPA that satisfies the following: user constantly answer yes/no questions (ex: tinder swipe cards) The application calculates each user's ...
vapurrmaid's user avatar
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0 votes
1 answer
272 views

I have two lists: 1: 1) A abc 2) A def 3) A ghi 4) B jkl 5) B mno 6) C fzy 7) C xxa 2: 1) vsf 2) jkl 3) fzy 4) xxa 5) xyz 6) mno 7) def 8) abc I am trying to match each of the continuous sequences ...
sigil's user avatar
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3 votes
1 answer
5k views

I need to search a long string of binary string data (couple of megabytes worth of binary digits) for patterns of binary digits. There are about 100 000 different patterns to search for. Each is a ...
user289944's user avatar
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5 votes
2 answers
1k views

I have written a simple class hierarchy to represent terms in Scala. Terms are recursive data types, e.g., a Sum and a Multiplication consist of the left-hand-side (lhs), which is a Term, and the ...
helios35's user avatar
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1 vote
5 answers
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I am looking at a problem where a method can fail in a predictable way. For now I think that exceptions might not be a good way to represent some of the failures (I may be wrong on that). In any case ...
Stilgar's user avatar
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6 votes
3 answers
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I understand that there is a thread discussing a similar issue here: How to efficiently search a set of vectors for a vector which is the closest match But my problem is slightly different - and ...
Ziqi's user avatar
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2 votes
0 answers
197 views

I have this two types open FSharpx open FSharpx.Reader type First = { Name: string Items: string list } type Second = { Name: string Numbers: int list } Using a Reader monad ...
fra9001's user avatar
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2 votes
1 answer
130 views

Let's say I'm programming a chess game. At some point I have to check, which moves are valid for a given piece. What would be the proper way to select the correct pathfinding function for a given ...
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