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    <p>You're going about it all wrong. I'm assuming that you want to set internal variables.</p> <p>If you want to create a 'constructor', do something like this:</p> <pre><code>function Item(itemName) { var next_item_id = 1; this.item_name = itemName; this.item_id = next_item_id++; } var Item1 = new Item('Desktop'); var Item2 = new Item('Laptop'); var Item3 = new Item('Monitor'); </code></pre> <p>Both item_name and item_id will be publicly available. To make use next_item_id like you want, try this:</p> <pre><code>Item.next_item_id = 1; </code></pre> <p>Then in your constructor, do Item.next_item_id++;</p> <p>Your final code should look something like this:</p> <pre><code>function Item(itemName) { this.item_name = itemName; this.item_id = Item.next_item_id++; } Item.next_item_id = 1; var Item1 = new Item('Desktop'); var Item2 = new Item('Laptop'); var Item3 = new Item('Monitor'); </code></pre> <p>What this is doing is attaching a property to the object Item. You might be thinking, "Item is a function! How is this possible?!". Nearly <strong>everything</strong> in JavaScript is an object with mutable properties. The only things that aren't are the keywords null and undefined (AFAIK).</p> <p>Item is still a function, but it also has a property next_item_id.</p> <p>Also, using new will create a new instance. This is a similar concept as in Java and other programming languages. Just calling Item is like calling a function, and you'll get back whatever is returned from it (through an explicit return statement, otherwise undefined).</p>
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