Proxy API usage scenarios —— Hide Property

hide-property.js

function hideProperty(target, prefix = "_") {
  return new Proxy(target, {
    has: (obj, prop) => !prop.startsWith(prefix) && prop in obj,
    ownKeys: (obj) =>
      Reflect.ownKeys(obj).filter(
        (prop) => typeof prop !== "string" || !prop.startsWith(prefix)
      ),
    get: (obj, prop, rec) => (prop in rec ? obj[prop] : undefined),
  });
}