rspec/rules/S2259/javascript/rule.adoc

When a variable is assigned an ``++undefined++`` or ``++null++`` value, it has no properties. Trying to access properties of such a variable anyway results in a ``++TypeError++``, causing abrupt termination of the script if the error is not caught in a ``++catch++`` block. But instead of ``++catch++``-ing this condition, it is best to avoid it altogether.

== Noncompliant Code Example

----
if (x === undefined) {
  console.log(x.length); // Noncompliant; TypeError will be thrown
}
----

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