Is there a "use double plus strict" in JavaScript?
<p>I sometimes misspell a variable name.<br>
I'd like for JavaScript to abort and say "X is undefined" instead of assigning the value of undefined to X continuing along it's merry way.</p>

<p>Q: Is there a setting or something that I can do to make it more plainly visible that I've misspelled a variable name?</p>
