Question

I am working my way through understanding how to create a constructor with properties and methods. The one below I have written and tested but it does not work. Could someone take the time to help me understand what it is that would make this not work. Understand that I have searched Google, I am reading books, etc., but needs some hands on support in understanding the concept with creating my own. Thank you.

function ball( type, grip, shape ) {
  this.type = type;
  this.grip = grip;
  this.shape = shape;
  this.caught = function( who,how ) {
    this.who = who;
    this.how = how;
  };
  this.player = function() {
    return (who + "caught the ball" + how + "that was a" + type + "shaped like 
            a " + shape + "thrown with a" + grip);
    };
};

var baseball = new ball("Mickey Mantle","sliding","baseball","circle","fastball");

console.log(ball);

Edit:
From the answers below – thank you for sharing – I have created my jsfiddle and can’t comprehend why the caught property is not working. How am I supposed to set the attributes for this method??

http://jsfiddle.net/uYTW6/

Answer 1

In your player function, you need to reference the variables who, how, type, shape and grip using this, i.e.

return (this.who + "caught the ball" + this.how + "that was a" + this.type + "shaped like 
        a " + this.shape + "thrown with a" + this.grip);
};

Furthermore, functions common to all objects of type ball should be put into the prototype, so that the function only will be created once:

ball.prototype.player = function() {
    return (this.who + "caught the ball" + this.how + "that was a" + this.type + "shaped like a " + this.shape + "thrown with a" + this.grip);
    };
}

It is also common convention to start the constructor function name with an uppercase letter, like B in your case (so your constructor function’s name is Ball, not ball).

Updated answer

You forgot to call the caught function on the baseball object, like so:

var baseball = new Ball("Mickey Mantle","sliding","baseball","circle","fastball");
baseball.caught('me', 'by hand');