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    <ul> <li><p>set <code>&lt;cffile&gt;</code> upload path to a web accessible, CF-enabled directory!!!</p></li> <li><p><code>isStruct()</code> before <code>isObject()</code> in a series of <code>&lt;cfif&gt;</code>'s expecting isStruct only catches struct (cfc component returns True from isStruct() as well)</p></li> <li><p>no <code>HtmlEditFormat()</code> when displaying user-generated content (XSS)</p></li> <li><p>forgot to add output=false on CFC methods</p></li> <li><p>not using <code>&lt;cfqueryparam&gt;</code> inside <code>&lt;cfquery&gt;</code></p></li> <li><p>not scoping not-so-evident variables like cfquery name or loop index in a method</p></li> <li><p>use <code>&lt;cfform&gt;</code> when all they need is plain-vanilla HTML <code>&lt;form&gt;</code></p></li> <li><p>forgot to <code>UrlEncodedFormat()</code> user-defined URL</p></li> <li><p>use <code>&lt;cffeed&gt;</code> without sanitizing the content</p></li> <li><p>trust <code>isDate()</code> too much (any number would return true)</p></li> <li><p>expect string comparison to be case-sensitive (IS and EQ operators are case-insensitive)</p></li> <li><p>sending strings "yes" or "no" to <code>SerializeJSON()</code> without appending a whitespace to preserve the string (otherwise <code>SerializeJSON()</code> or <code>DeserializeJSON()</code> will translate them to "true" and "false")</p></li> <li><p>not putting singletons services in application scope</p></li> <li><p>blindly create as much CFCs as one wants like one would do in JAVA</p></li> <li><p>putting complex value/object into a list (can't, list is just a string of comma-seperated values)</p></li> <li><p>writing functions that takes array as an argument and modify that array expecting that array will be modified (array in CFML is passed by value)</p></li> <li><p>blindly changes <code>access="remote"</code> on a method and expect it to work (when remote proxy is generally more appropriate)</p></li> <li><p>use a lot of WriteOutput() in cfscript when CFML is more appropriate</p></li> <li><p>blindly uses <code>IsDefined()</code> when <code>StructKeyExists()</code> can generally do it more efficiently</p></li> <li><p>blindly uses <code>Iif()</code> and <code>De()</code> without knowing they're as nasty as Evaluate() </p></li> <li><p>update some code in onApplicationStart() and not seeing the difference on refresh (restart the app!)</p></li> <li><p><code>&lt;cfloop&gt;</code> or '' outside of <code>&lt;cfquery&gt;</code> causing multiple new query connections to be opened. 99% of the time it's better to have multiple statements inside of one cfquery to perform multiple actions, or to UNION data together.</p></li> <li><p>hardcoding absolute path when <code>ExpandPath()</code> is generally better </p></li> <li><p>forgot to turn on Unicode support in DSN (Unicode becomes '????')</p></li> <li><p>not upgrading to the latest JRE and Hotfixes</p></li> <li><p>misusing Client scope and blow up Windows registry...</p></li> <li><p>uses depreciated/obsolete functions/features (i.e. flash form aka flex 1.x alpha, cftable, Verity full-text search, etc...)</p></li> <li><p>passing <code>CFCATCH</code> to a function as argument type <code>Struct</code> (<code>CFCATCH</code> behaves like a <code>Struct</code>, but it is not. Just pass it as type '<code>Any</code>').</p></li> <li><p>Not reading <a href="http://ortus.svnrepository.com/coldbox/trac.cgi/wiki/cbCFCBestPractices" rel="noreferrer">CFC Best Practices</a> from ColdBox wiki.</p></li> <li><p>buying in the mindset of .ASP(X) or .JSP or [insert web technology] are always better.. ;)</p></li> <li><p>not use <code>PrecisionEvaluate()</code> and getting all sort of floating point rounding error especially when calculating money.</p></li> </ul>
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    1. POCommon programming mistakes for ColdFusion programmer to avoid?
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    1. CO@Henry - this is quite a list my man! Thank you.
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      1. USAndrew Siemer
    2. COstill thinking what to add onto the list... :)
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    3. CO@Henry: Small typo - it's `HTMLEditFormat()`. (One reason for the commonness of XSS vulnerabilities is that the HTML escape functions names are so verbose everywhere: `htmlspecialchars()`, `Server.HTMLEncode()`, you name it. Usually I make a wrapper function for `HTMLEditFormat()` and call that `h()`, which is very convenient. Along with a wrapper for URLEncodedFormat called `u()`.)
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