2021-06-02 20:44:38 +02:00

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The unary operators ``+`` and ``++-++`` can be used to convert some value types to numeric values. But not every value can be converted to a ``++Number++`` type; use it with an object, and result will be ``++NaN++`` (Not A Number). This can be confusing to maintainers.
== Noncompliant Code Example
----
var obj = {x : 1};
doSomethingWithNumber(+obj); // Noncompliant
function foo(){
return 1;
}
doSomethingWithNumber(-foo); // Noncompliant
----
== Compliant Solution
----
var obj = {x : 1};
doSomethingWithNumber(+obj.x);
function foo(){
return 1;
}
doSomethingWithNumber(-foo());
var str = '42';
doSomethingWithNumber(+str);
----
== Exceptions
Unary ``{plus}`` and ``++-++`` can be used with objects corresponding to primitive types, and ``{plus}`` can be used with ``++Date++``.
----
var b = new Boolean(true);
doSomethingWithNumber(-b); // Compliant
var timestamp = +new Date(); // Compliant
----
ifdef::rspecator-view[]
== Comments And Links
(visible only on this page)
include::comments-and-links.adoc[]
endif::rspecator-view[]