let bears = { grizzly: true }

let grizzlyCount = 0

const proxyBears = new Proxy(bears, {

get: function (target, prop, receiver) { // receiver is the proxy object itself, which is proxyBears

if (prop === 'grizzly') grizzlyCount++

return Reflect.get(target, prop, receiver) //instead of returning target[prop] we can use Reflect like this

// return target[prop]

},

set: function (target, prop, value, receiver) {

if (['grizzly', 'brown', 'polar'].indexOf(prop) === -1) {

throw new Error('THAT IS TOTALLY NOT A BEAR!')

}

return Reflect.set(target, prop, value, receiver)

// target[prop] = value

},

deleteProperty: function (target, prop) {

console.log(`You have deleted ${prop}`)

delete target[prop]

}

})

//proxyBears.aardvark = true

proxyBears.polar = true

proxyBears.brown = false

//delete proxyBears.polar

//console.log(proxyBears.polar)

console.log(bears)

proxyBears.grizzly

proxyBears.grizzly

proxyBears.grizzly

proxyBears.grizzly

console.log(grizzlyCount)

function growl() {

return 'grrr'

}

const loudGrowl = new Proxy(growl, {

apply: function (target, thisArg, args) {

return target().toUpperCase() + '!!!'

}

})

console.log(loudGrowl())