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rename dir scripts -> examples

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Joeri Exelmans 2025-04-18 09:14:09 +02:00
parent bc9dce4b9c
commit 28f60e77be
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examples/num.js Normal file
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import { assign } from "../generics/generics.js";
import { makeGeneric } from "../generics/generics.js";
import { Double, Int } from "../primitives/types.js";
import { fnType } from "../structures/types.js";
import { pretty } from '../util/pretty.js';
import { getMul, NumInstances } from "../typeclasses/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
(numDictType(a))
(fnType(a)(a))
);
console.log("should be: Int -> Int");
console.log(pretty(assign(squareFnType, makeGeneric(() => numDictType(Int)))));
console.log("should be: Double -> 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
console.log("");
console.log(square(NumInstances.get(Int))(42n)); // 1764n