== Why is this an issue?

Constructor functions, which create new object instances, must only be called with ``++new++``. Non-constructor functions must not. Mixing these two usages could lead to unexpected results at runtime.


=== Noncompliant code example

[source,javascript]
----
function getNum() {
  return 5;
}

function Num(numeric, alphabetic) {
  this.numeric = numeric;
  this.alphabetic = alphabetic;
}

var myFirstNum = getNum();
var my2ndNum = new getNum();  // Noncompliant. An empty object is returned, NOT 5

var myNumObj1 = new Num();
var myNumObj2 = Num();  // Noncompliant. undefined is returned, NOT an object
----

ifdef::env-github,rspecator-view[]

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== Implementation Specification
(visible only on this page)

include::message.adoc[]

include::highlighting.adoc[]

endif::env-github,rspecator-view[]