How can you change the context of a function?

The function context in JavaScript is the value of this, which is determined at the moment the function is called.

The function context can be changed in several ways:

• Methods call and apply: invoke a function with a specified context.

function greet() {
  console.log(this.name);
}
const obj = { name: "Alice" };
greet.call(obj);  // Outputs "Alice"
greet.apply(obj); // Outputs "Alice"

• Method bind: creates a new function with a bound context.

const boundGreet = greet.bind(obj);
boundGreet(); // "Alice"

• Arrow functions: do not have their own this; the context is taken from the outer scope.

• Calling an object method: when calling obj.method(), inside method, this refers to obj.

• Using Function.prototype.bind to preserve context in callbacks.

Thus, to change the function context in Node.js (and in JavaScript in general), call, apply, and bind are most commonly used.