classes js rat unity

class Rat{
    constructor(name){
        this.name=name;
        this.rats=[];

    }
    unite(rat){

        if(rat instanceof Rat){
            this.rats.push(rat);
        }
    };
    getRats(){
        return this.rats;
    }
    toString(){
      let ratsNames=this.rats.map(x=>{
          return `##${x.name}`;
      });
      let result=`${this.name}${'\n'}${ratsNames.join('\n')}`;
      return result;
    }
}