49-this-keyword.md

this key word and it's uses in many places

The keyword "this" in JavaScript refers to the current execution context, which can vary depending on how a function is called.

It has several uses in JavaScript, including:

1. Referring to the global object:

console.log(this); // logs the global object (window in browsers, global in Node.js)

2. Referring to an object's properties or methods:

const person = {
  name: "John",
  age: 30,
  sayHello() {
    console.log(`Hello, my name is ${this.name}`);
  }
};

person.sayHello(); // logs "Hello, my name is John"

3. Setting the value of "this" explicitly using Function.prototype.call(), Function.prototype.apply(), or Function.prototype.bind():

function greet() {
  console.log(`Hello, my name is ${this.name}`);
}

const person1 = { name: "John" };
const person2 = { name: "Jane" };

greet.call(person1); // logs "Hello, my name is John"
greet.apply(person2); // logs "Hello, my name is Jane"

const greetJohn = greet.bind(person1);
greetJohn(); // logs "Hello, my name is John"

4. Referring to the constructor function when creating new objects with the "new" keyword:

function Person(name, age) {
  this.name = name;
  this.age = age;
}

const john = new Person("John", 30);
console.log(john.name); // logs "John"