extend.html

<script>
    (function(){
        let proprty, car = {
            make: 'Jeep',
            model: 'Wrangler',
            accelerate: function(){
                return this.model + ' drives away'
            },
            brake: function(){
                return this.make + ' pulls up'
            }
        }
        for( property in car ){
            console.log( property + ': ' + car[ property ])
        }
        car.make = 'Ford'
        car.model = 'Bronco'
        car.engine = 'V6'
        car.start = function(){
            return this.make + 'motor is running'
        }
        console.log('\nCar is a  ' + car.make + ' ' + car[' model'])
        console.log('Engine.type: '+ car.engine)
        console.log( car.start() )
        console.log( car.accelerate() )
        console.log(car.brake())
    
    })()
</script>