Hash Tables & JavaScript Objects

const proxy = new Proxy({}, {
  get: (target, prop) => {
    return prop in target ? target[prop] : 0;
  }
});

Property validation
Default values for missing properties
This Proxy provides default values because: 1) Intercepts property access attempts, 2) Returns 0 for non-existent properties, 3) Returns actual value for existing properties, 4) Prevents undefined return values, 5) Useful for default value handling, 6) Common pattern in configuration objects, 7) More flexible than Object.prototype for defaults, 8) Can be extended for complex default logic.
Property tracking
Access restriction