JavaScript Proxy_reflect Guide
Proxy and Reflect enable custom behavior for fundamental object operations: property access, assignment, deletion, and function calls. The guide walks through Creating Proxies, Reflect API. `new Proxy(target,{get(obj,key){...},set(obj,key,val){...}})` — trap operations. Validation: set trap checks values. Logging: get/set traps log access. Default values: get trap returns defaults. Revocable: `Proxy.revocable(t,handler)` with `.revoke()`. `Reflect.get(target,key)` — default get behavior. `Reflect.set(target,key,val)` — default set. `Reflect.has(target,key)` — in operator. `Reflect.deleteProperty(target,key)` — delete. `Reflect.apply(fn,thisArg,args)` — function call. Use Reflect inside Proxy traps for default behavior. The guide is organized into 2 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.