const myObj = {
  a: 10,
  method1() {
    const printThis = () => console.log(this);
    printThis();
  },
  method2: () => {
    const printThis = () => console.log(this);
    printThis();
  },
};
 
myObj.method1(); //
myObj.method2(); //
 
const res = myObj.method1.call({ a: 1 }); //
myObj.method2.call({ a: 1 }); //

const myObj = {
  a: 10,
  method1() {
    const printThis = () => console.log(this);
    printThis();
  },
  method2: () => {
    const printThis = () => console.log(this);
    printThis();
  },
};
 
myObj.method1(); //  myObj{}
myObj.method2(); //  undefined
 
const res = myObj.method1.call({ a: 1 }); // {a : 1}
myObj.method2.call({ a: 1 }); // undefined