Final answer:
To access variables from a constructor function, the 'this' keyword is used inside the constructor to assign properties to object instances that can be accessed using dot notation.
Step-by-step explanation:
To access variables from a constructor function, you typically use the this keyword within the constructor to create properties on the instance of the object. For example, if you have a constructor function for a Car with a variable for the make, you would write:
function Car(make) {
this.make = make;
}
After defining the constructor, you can create a new Car object and access the make property like this:
var myCar = new Car('Toyota');
console.log(myCar.make); // Outputs: Toyota
In this example, make is a property of the Car object that was set using the this keyword inside the constructor function. This allows the property to be accessed using the dot notation on any instance of the Car class.