class Hero {
	

	

		 constructor (name) {
	

	

		 this.name = name
	

	

		 console.log(`hi this is ${this.name}`)
	

	

		}
	

	

		 kill (num) {
	

	

		 let complex = (num === 1) ? 'bug' : 'bugs'
	

	

		 console.log(`kill ${num} ${complex}`)
	

	

		 return this
	

	

		}
	

	

		 recover (num) {
	

	

		 let complex = (num === 1) ? 'blood' : 'bloods'
	

	

		 console.log(`recover ${num} ${complex}`)
	

	

		 return this
	

	

		}
	

	

		 sleep (time) {
	

	

		 let now = +new Date()
	

	

		 while (+new Date() - now < time * 1000) {}
	

	

		 return this
	

	

		}
	

	

		}
	

	

		new Hero('aaa').sleep(10).kill(2).recover(1)