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kotlinlang

How is the term `syntax` used in naming classes or packages in Arrow or apps that use Arrow?  I've seen this pattern before, but I don't recall where.  Is it used interchangeably with the term `ops`?  Or maybe it was in Scala code...

`syntax` refers to functions that can be derived from a given contract.
As in “syntax” is something you get for free based on core functionality.

I.e. when I have a `Monoid&lt;A&gt;` which provides me with an `empty` and `combine` function I can derive the syntax `combineAll`

```fun &lt;A&gt; List&lt;A&gt;.combineAll(MA: Monoid&lt;A&gt;): A = fold(MA.empty()) { acc, a -&gt;
   MA.run { acc.combine(a) }
}```
In Scala this also called syntax, but can be provided more elegantly if you require `Monoid&lt;A&gt;` as an implicit.

```implicit class MonoidOps(val a: A): AnyVal {
   def combineAll(fa: List[A], implicit MA: Monoid[A]): A
}```

What we can do however in Kotlin is project syntax.
If you define `Monoid&lt;Int&gt;` we can generate an extension function:

`fun List&lt;Int&gt;.combineAll(): Int = Int.monoid().run { this@combineAll.combineAll() }`

Ah, all is illuminated! Thank you <@U0RM4EPC7>.

And when you say "generate an extension function",  are you referring to the `@extension` code generation of the Meta plugin?

Yes, that’s exactly what I was referring to :+1: