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const IndexedArray = new Proxy(Array, {

construct: function (target, [originalArray]) {

const index = {}

originalArray.forEach(function (item) {

index[item.id] = item

})

const newArray = new target(...originalArray)

return new Proxy(newArray, {

get: function (target, name) {

if (name === 'push') {

return function (item) {

index[item.id] = item

return target[name].call(target, item)

}

} else if (name === 'findById') {

return function (searchId) {

return index[searchId]

}

}

return target[name]

}

})

}

})

const bears = new IndexedArray([

{

id: 2,

name: 'grizzly',

},

{

id: 4,

name: 'black',

},

{

id: 3,

name: 'polar',

},

])

bears.push({

id: 55,

name: 'brown'

})

const brown = bears.findById(55)

console.log(brown)

console.log(bears.findById(3))

// const index = {}

// bears.forEach(function (bear) {

// index[bear.id] = bear

// })

//

// const polar = index[3]

// const black = index[4]