DuplicateVarDecl.qhelp

<!DOCTYPE qhelp PUBLIC
  "-//Semmle//qhelp//EN"
  "qhelp.dtd">
<qhelp>
<overview>
<p>
A variable declaration statement that declares the same variable twice is confusing and hard to
maintain.
</p>

</overview>
<recommendation>

<p>
Remove one of the two declarations. When removing a declaration with an initializer, further changes
may be necessary to ensure that the variable is correctly initialized.
</p>

</recommendation>
<example>

<p>
In the following example, the variable declaration statement declares the variable <code>dom</code>
twice. The second declaration is unnecessary, and since it has no initializer it can simply be
removed.
</p>

<sample src="examples/DuplicateVarDecl.js" />

</example>
<references>


<li>Ecma International, <i>ECMAScript Language Definition</i>, 5.1 Edition, Section 12.2. ECMA, 2011.</li>


</references>
</qhelp>