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type inferencing "unifying" operation is now bi-directional + begin writing generic version of "unifying" operation (that should work on all types)

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Joeri Exelmans 2025-03-20 19:59:24 +01:00
parent c5ac55b0ff
commit 33c156fc5c
5 changed files with 148 additions and 9 deletions
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5
typeclasses/num.test.js
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@ -2,6 +2,7 @@ import { assign } from "../generics/generics.js";
import { makeGeneric } from "../generics/generics.js";
import { fnType } from "../metacircular.js";
import { Double, Int } from "../primitives/symbols.js";
import { getMul, NumInstances } from "./num.js";
import { numDictType } from "./num_type.js";
const square = numDict => x => getMul(numDict)(x)(x);
@ -21,3 +22,7 @@ console.log(assign(squareFnType, makeGeneric(() => numDictType(Int))));
// should be: Double -> Double
console.log(assign(squareFnType, makeGeneric(() => numDictType(Double))));
// to call 'square' we need:
// - access to a mapping from types to their typeclass instantiation
// - to know that our argument is 'Int'
console.log(square(NumInstances.get(Int))(42n)); // 1764n