@virtualstate/examples/lib/examples/experiments/combinational/truthful.js

import { createFragment } from "@virtualstate/fringe";
import { isTrue } from "./truth.js";
// This is like an AND, but only cares about if we _finish_ with an AND
// If it does not finish in an AND, it will throw an error.
export async function* Truthful(o, state) {
    const children = state?.children;
    if (!children) {
        throw new Error("Expected state to be provided");
    }
    let isPreviousTrue = false;
    for await (const result of children) {
        isPreviousTrue = result.every(isTrue);
        if (isPreviousTrue) {
            yield createFragment({}, ...result);
        }
    }
    if (!isPreviousTrue) {
        throw new Error("Expected state to be truthy");
    }
}
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