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This commit is contained in:
Joeri Exelmans 2025-03-24 17:28:07 +01:00
parent 6af72e525c
commit 145835ad5d
22 changed files with 153 additions and 90 deletions
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21
typeclasses/num.test.js
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@ -1,29 +1,28 @@
import { assign } from "../generics/generics.js";
import { makeGeneric } from "../generics/generics.js";
import { fnType } from "../structures/function.js";
import { Double, Int } from "../primitives/types.js";
import { fnType } from "../structures/types.js";
import { pretty } from "../util.js";
import { getMul, NumInstances } from "./num.js";
import { numDictType } from "./num_type.js";
const square = numDict => x => getMul(numDict)(x)(x);
// NumDict a -> a -> a
const squareFnType = makeGeneric(a =>
fnType({
in: numDictType(a),
out: fnType({
in: a,
out: a,
}),
}));
fnType
(numDictType(a))
(fnType(a)(a))
);
console.log("should be: Int -> Int");
console.log(assign(squareFnType, makeGeneric(() => numDictType(Int))));
console.log(pretty(assign(squareFnType, makeGeneric(() => numDictType(Int)))));
console.log("should be: Double -> Double");
console.log(assign(squareFnType, makeGeneric(() => numDictType(Double))));
console.log(pretty(assign(squareFnType, makeGeneric(() => numDictType(Double)))));
// to call 'square' we need:
// - the type of our argument (=Int)
// - access to a mapping from types to their typeclass instantiation
// - to know that our argument is 'Int'
console.log("");
console.log(square(NumInstances.get(Int))(42n)); // 1764n