@benev/slate/x/tools/deep/parts/equal.js

frontend web stuff

import { is } from "../../is.js";
export const deepEqual = (alpha, bravo) => {
    function recurse(alpha, bravo, parents) {
        if (!is.object(alpha) || !is.object(bravo))
            return alpha === bravo;
        if (parents.includes(alpha))
            throw new Error(`forbidden circularity detected in deep equal comparison`);
        const newParents = [...parents, alpha];
        if (alpha instanceof Map && bravo instanceof Map) {
            if (alpha.size !== bravo.size)
                return false;
            for (const [key, val] of alpha)
                if (!bravo.has(key) || !recurse(val, bravo.get(key), newParents))
                    return false;
        }
        else if (alpha instanceof Set && bravo instanceof Set) {
            if (alpha.size !== bravo.size)
                return false;
            for (const item of alpha)
                if (!Array.from(bravo).some(bItem => recurse(item, bItem, newParents)))
                    return false;
        }
        else {
            const keys1 = Object.keys(alpha);
            const keys2 = Object.keys(bravo);
            if (keys1.length !== keys2.length)
                return false;
            for (const key of keys1) {
                if (!keys2.includes(key))
                    return false;
                if (!recurse(alpha[key], bravo[key], newParents))
                    return false;
            }
        }
        return true;
    }
    return recurse(alpha, bravo, []);
};
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