Detecting changes in a Javascript array using the Proxy object

Question

It is relatively trivial to watch for changes in an array in Javascript.

One method I use is like this:

// subscribe to add, update, delete, and spli         


        

Answer 1

You can do somthing like this

new Proxy([], {
    get(target, prop) {
        const val = target[prop];
        if (typeof val === 'function') {
            if (['push', 'unshift'].includes(prop)) {
                return function (el) {
                    console.log('this is a array modification');
                    return Array.prototype[prop].apply(target, arguments);
                }
            }
            if (['pop'].includes(prop)) {
                return function () {
                    const el = Array.prototype[prop].apply(target, arguments);
                    console.log('this is a array modification');
                    return el;
                }
            }
            return val.bind(target);
        }
        return val;
    }
});