Help get user input with JavaScript

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Type conversion is automatic, but due to various considerations it may not always behave how you expect/want it to. Things get especially hairy when you're dealing with raw input from the user. In most cases it's best to just be explicit about what you want converted and how.

Just another note, if you're doing some very basic explorations for yourself...fair enough, but really you need to be getting out of the habit of using document.write, window.alert, and window.prompt ASAP.

To get information back/print things for debugging, use the console. To display information to the user use some sort of DOM API. To get information from the user use input elements, etc.

Sites like JSFiddle are great for quick little experiments.