@sebgroup/frontend-tools/esm/deepCopy/deepCopy.js

A set of frontend tools

/**
 * Get a deep copy of an object
 * @param obj any complex object
 * @returns {Object} The generated object
 */
function deepCopy(obj, hash = new WeakMap()) {
    if (Object(obj) !== obj) {
        // Primitive type
        return obj;
    }
    else if (obj instanceof Set) {
        // Setter
        return new Set(obj);
    }
    else if (hash.has(obj)) {
        // Cyclic reference
        return hash.get(obj);
    }
    else {
        let result = Object.create(null);
        if (obj instanceof Date) {
            // Date object
            result = new Date(obj.getTime());
        }
        else if (obj instanceof RegExp) {
            // Regular expression
            result = new RegExp(obj.source, obj.flags);
        }
        else if (obj.constructor) {
            result = isSymbol(obj) ? obj : new obj.constructor(); // symbol should be referenced only
        }
        hash.set(obj, result);
        if (obj instanceof Map) {
            // Map object
            Array.from(obj, ([key, val]) => result.set(key, deepCopy(val, hash)));
        }
        return Object.assign(result, ...Object.keys(obj).map((key) => ({
            [key]: deepCopy(obj[key], hash),
        })));
    }
}
/**
 * check if the variable is a symbol
 * @param x obj or any datatype
 */
function isSymbol(x) {
    return (typeof x === "symbol" ||
        (typeof x === "object" &&
            Object.prototype.toString.call(x) === "[object Symbol]"));
}

export { deepCopy };
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