this Keyword in JavaScript

The this keyword in JavaScript depends on the context where it is used:

1. Global Context:
   • Refers to the global object (window in the browser, global in Node.js).
2. Regular Function:
   • Refers to the object that calls the function.
3. Arrow Function:
   • Defined by the lexical context.
4. Classes:
   • Refers to the instance of the class.
5. Strict Mode:
   • this is undefined in the global context and functions.
6. Event Handlers:
   • Refers to the element that triggered the event.

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Example

function logThis() {
  console.log(this);
}

const obj = {
  logThis,
  logthis2() {
    return logThis();
  },
  logThis3() {
    return obj.logThis();
  },
};

obj.logThis();
obj.logthis2();
obj.logThis3();