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JS Functions

In this example, myFunction is a function constructor:

function myFunction(arg1, arg2) {
  this.firstName = arg1;
  this.lastName  = arg2;
}

const myObj = new myFunction("John","Doe");
document.getElementById("demo").innerHTML = myObj.firstName;

A constructor invocation creates a new object. The new object inherits the properties and methods from its constructor.

• The this keyword in the constructor does not have a value.
• The value of this will be the new object created when the function is invoked.