mini-state-machine/dist/clone.js

A miniature state machine

const _getClassOf = Function.prototype.call.bind(Object.prototype.toString);
export function cloneArray(arr) {
    return arr.map(value => Array.isArray(value) ? cloneArray(value) : isCloneable(value) ? cloneObject(value) : value);
}
export function cloneObject(object) {
    const copy = Object.assign({}, object);
    for (const prop in copy) {
        if (!copy.hasOwnProperty(prop))
            continue;
        if (Array.isArray(copy[prop])) {
            copy[prop] = cloneArray(copy[prop]);
        }
        else if (isCloneable(copy[prop])) {
            copy[prop] = cloneObject(copy[prop]);
        }
    }
    return copy;
}
function getClassOf(object) {
    const internal = _getClassOf(object);
    if (internal !== "[object Object]")
        return internal;
    return `[object ${Object.getPrototypeOf(object).constructor.name}]`;
}
function isCloneable(value) {
    return !!value && typeof value === "object" && isPlainObject(value);
}
function isPlainObject(object) {
    return getClassOf(object) === "[object Object]";
}