classObj{
constructor(){
this.sleep=0
}
write(str){
if(this.sleep){
setTimeout(()=>{
console.log(str)
},
this.sleep)
}else{
console.log(str)
}
returnthis
}
await(time){
this.sleep+=time
returnthis
}
}
constobj=newObj()
obj.write('1').await(1000).write('2').await(3000).write(3)