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let bears = { grizzly: true }

let grizzlyCount = 0

const proxyBears = new Proxy(bears, {

get: function (target, prop) {

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

return target[prop]

},

set: function (target, prop, value) {

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

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

}

target[prop] = value

},

deleteProperty: function (target, prop) {

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

delete target[prop]

}

})

//proxyBears.aardvark = true

proxyBears.polar = true

//delete proxyBears.polar

//console.log(proxyBears.polar)

// 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())