This Keyword

this = reference to the object where this is used.

(the object depends on the immediate context)
`person.name = this.name`

const person1 = {
	name: "Spongebob",
	favFood: "hamburgers",
	sayHello: function(){console.log(`HI! I am ${this.name}`)},
	eat: function(){console.log(`${this.name} loves ${this.favFood}`)}
}
 
const person2 = {
	name: "Patrick",
	favFood: "Pizza",
	sayHello: function(){console.log(`HI! I am ${this.name}`)},
	eat: function(){console.log(`${this.name} loves ${this.favFood}`)}
}
 
person1.sayHello();
person2.eat();

in ()=>{} arrow function, this will return window object

const person1 = {
	name: "Spongebob",
	favFood: "hamburgers",
	sayHello: () => {console.log(`HI! I am ${this.name}`)},
	eat: () => {console.log(`${this.name} loves ${this.favFood}`)}
}
 
person1.eat();
 
//return " loves undefined"
//this.name = window.name
//this.favFood = window.favFood

Related

• Object in JS
• arrow functions
• JS - Objects and Classes