Execution context example

this-example.js

const person = {
  name: 'Ivan', 
  age: 24,
  showInfo() {
    console.log('Info is: ', this.name, this.age)
  }
};

const person2 = {
  name: 'Anna', 
  age: 20,
  showInfo: person.showInfo //context is not fixed
};


const person3 = {
  name: 'Anna', 
  age: 20,
  showInfo: person.showInfo.bind(person) //context is fixed
};

const person4 = {
  name: 'Anna', 
  age: 20,
  showInfo: () => {
    person.showInfo() //context is fixed
  }
};

person2.showInfo(); //context of method is person2 
person3.showInfo(); //context of method is person
person4.showInfo(); //context of method is person 

const testObj = {
  data: 'data',
    runCallback(cb){
      console.log('This in callback ', this);
      cb();
    }
};

const testObj2 = {
  data: 'data . 1111',
  showThis(){
    console.log('ob1 ', this);
  }
};

testObj.runCallback(testObj2.showThis);