Question 1

How to add custom units in Squants?

Accepted Answer

You need to extend the appropriate Dimension and UnitOfMeasure traits, following the library's type hierarchy shown in the README. For example, define a new unit object similar to Meters or Yards, but this requires understanding the internal architecture and may be complex for ad-hoc needs.

Question 2

Squants vs using plain Doubles for unit handling?

Accepted Answer

Squants provides compile-time safety and automatic conversions, preventing runtime errors common with Doubles. However, it adds object overhead and complexity, making it better for safety-critical applications but potentially overkill for simple scripts or performance-sensitive code.

Question 3

How to handle currency conversions with Squants?

Accepted Answer

Use the Market package with Money, Price, and CurrencyExchangeRate types, along with an implicit MoneyContext for default settings. The README shows examples like converting USD to JPY using exchange rates and the `convert` method or `*` operator.

Question 4

What's the performance impact of Squants in Scala apps?

Accepted Answer

Squants introduces object creation, type checks, and implicit conversions, which can add overhead compared to raw doubles. For most applications, the safety benefits outweigh this, but in high-throughput or low-latency scenarios, benchmarking is advised to assess impact.

Question 5

How to serialize Squants quantities to JSON?

Accepted Answer

Integrate with third-party libraries like PureConfig or Ciris, which have listed support. Alternatively, use methods like `toTuple` or custom serializers to convert quantities to basic types (Double, String) for JSON encoding, as mentioned in the unit conversions section.

Squants

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