Question

I try to send a name and a color to the constructor function below. The method this.whatAreYou() should to retrieve these strings when called.

I want to display this on the screen.

I have the following code:

function Gadget(name, color) {
    this.name = name;
    this.color = color;
    this.whatAreYou = function() {
        return 'I am a ' + this.name+ ' ' + this.color;
    };
}

string = Gadget(grass, green);
alert(string);​

however the alert is not functioning. How can I achieve my desired behaviour?

Answer 1

Your Gadget isn’t a string. It just holds a function returning a string.

As you seem to try to create an instance of the Gadget class, you need to use the new operator.

If grass and green aren’t predefined variables but strings, you need to put them between quotes.

Try

var g = new Gadget('grass', 'green');
alert(g.whatAreYou());​