js-randomness-predictor/dist/esm/cli/runPredictor.js

Predict Math.random output in Node, Chrome, and Firefox

import JSRandomnessPredictor from "../index.js";
import { SequenceNotFoundError, DEFAULT_NUM_PREDICTIONS } from "./types.js";
export async function runPredictor(argv) {
    if (!argv.sequence && argv.environment !== "v8") {
        throw new SequenceNotFoundError();
    }
    const numPredictions = argv.predictions === undefined ? DEFAULT_NUM_PREDICTIONS : argv.predictions;
    const sequence = argv.sequence === undefined ? Array.from({ length: 4 }, Math.random) : argv.sequence;
    const predictor = JSRandomnessPredictor[argv.environment](sequence);
    const predictions = [];
    for (let i = 0; i < numPredictions; i++) {
        predictions.push(await predictor.predictNext());
    }
    // Default value for optional results.
    const optionalResults = {
        actual: "You'll need to get this yourself via the same way you generated the sequence",
    };
    // Since we are running this CLI in v8 we can automatically get the next random numbers.
    if (argv.environment === "v8" && !argv.sequence) {
        optionalResults.actual = [];
        for (let i = 0; i < numPredictions; i++) {
            optionalResults.actual.push(Math.random());
        }
        // Again, since we are already in v8, we can verify results automatically.
        optionalResults.isCorrect = optionalResults.actual.every((v, i) => v === predictions[i]);
    }
    return {
        sequence,
        predictions,
        ...optionalResults,
    };
}