Squants
newtype-ts
| Squants | newtype-ts | |
|---|---|---|
| 8 | 12 | |
| 910 | 570 | |
| -0.1% | - | |
| 2.9 | 0.0 | |
| 15 days ago | almost 2 years ago | |
| Scala | TypeScript | |
| Apache License 2.0 | MIT License |
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Squants
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Improving our safety with a physical quantities and units library
Scala's squants library is a nice implementation of units-of-measure/dimensional-analysis http://www.squants.com
In particular it uses types for dimensions; whilst units are just constructors. Hence `Meters(2)` and `Microns(7)` have the same type (`Length`).
- Show HN: Numbat – A programming language with physical dimensions as types
- The type system is a programmer's best friend
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Is Scala a good choice for a data intensive web backend?
squants for the “Market” package to use in financial calculations.
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Please put units in names
take a peek at https://www.squants.com looks like not in your language, but maybe you can apply some same concepts
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Atlas, a (hopefully) better engineering IDE
You might find the Squants library for Scala interesting; it even seems like an apt usage of some oft-questioned language features.
https://github.com/typelevel/squants
- Ratio Templates?
newtype-ts
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Type-Safe Printf() in TypeScript
Curious what your issue was with duck-typing. Were you effectively looking to create ADTs that are required to go through a specific step-by-step process, not simply 'look like' the thing that was expected?
If so, you might be interested in [newtype-ts].
[newtype-ts]: https://github.com/gcanti/newtype-ts
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Is there a language with custom type support (value objects)?
this one https://github.com/gcanti/newtype-ts ?
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I too prefer no classes
You don't need classes for nominal types: https://github.com/gcanti/newtype-ts
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When do you find Branding to be useful?
Creating newtypes (via newtype-ts) for fractions and percentages is worthwhile if you're very concerned about correctness, though it's unfortunate that absent typeclasses they're not terribly ergonomic.
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Please put units in names
I haven't used this library in particular or this one, but bless the authors and all the others for trying to make it happen… the project I'm now leading uses strongly typed strings for different component addresses, and it saves me to constantly look up the documentation what the functions need – it's beautiful.
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Type that's NOT another type?
A "nominal" solution with no runtime overhead can be provided by branded types, other words for this are "opaque types" or "newtypes". Some libraries like newtype-ts exist to help with the construction of these. That library README describes it as:
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Is there a way to guarantee that a number variable can never be a non-finite value?
You can also look at the fp-ts ecosystem for inspiration. newtype-ts and io-ts's Branded type with io-ts-type's UUID as a good example
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Branding & Flavoring
Alternatively we can use other more sophisticated techniques to achieve nominal typing or libraries such as: newtype-ts or io-ts.
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Introduction
One using fp-ts and newtype-ts
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Using fp-ts and newtype-ts: types
We are going to use newtype-ts to build a branded type:
What are some alternatives?
Breeze - Breeze is a numerical processing library for Scala.
io-ts - Runtime type system for IO decoding/encoding
Axle - Axle Domain Specific Language for Scientific Cloud Computing and Visualization
type-fest - A collection of essential TypeScript types
PredictionIO - PredictionIO, a machine learning server for developers and ML engineers.
fantasy-land - Specification for interoperability of common algebraic structures in JavaScript
Spire - Powerful new number types and numeric abstractions for Scala.
io-ts-types - A collection of codecs and combinators for use with io-ts
rscala - The Scala interpreter is embedded in R and callbacks to R from the embedded interpreter are supported. Conversely, the R interpreter is embedded in Scala.
fp-ts - Functional programming in TypeScript
Compute.scala - Scientific computing with N-dimensional arrays
da-unit - Typescript unit conversions