In this post I will show you how to use a Proxy.
The concept of a proxy is pretty simple. You provide triggers that run when you are getting or setting something in an object.
// private user object const _user = { name: "User", age: 25, _address: "A place" } const traps = { get(target, prop) { if (prop[0] === "_") { return undefined; } } } const user = new Proxy(_user, traps); console.log(user.name) // User console.log(user.age) // 25 console.log(user._address) // undefined As shown in the example above, Proxies can be used for stopping programs from accessing private variables.
They can also be used to stop programs from setting private variables.
// private user object const _user = { name: "User", age: 25, _address: "A place" } const traps = { get(target, prop) { if (prop[0] === "_") { return undefined; } }, set(target, prop, value) { if (prop[0] === "_") { return; } else { target[prop] = value; } } } const user = new Proxy(_user, traps); user.name = "Person"; user.age = 26; user._address = "In the world"; // Doesn't set You can read more about Proxies on the MDN.
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