getAllstudents(stdnt: string){
    let clsss=new Object();
    this.clssservice.getclsss(stdnt)
    .subscribe(
      stndt =>{
        for(let key in stndt ){
          clsss=stdnt[key];
          clsss['$key']=key;

error 1:
Element implicitly has an ‘any’ type because expression of type ‘string’ can’t be used to index type ‘Object’.
No index signature with a parameter of type ‘string’ was found on type ‘Object’.ts

(parameter) stndt string can’t be used to index type Object.

error 2:
Element implicitly has an ‘any’ type because expression of type ‘”$key”‘ can’t be used to index type ‘Object’.
let clsss: Object

I tried to use : string, type of string, key of string, as string but these solutions did not work.