Being tired of all the idiosyncrasies of the typeof() operator, I
tried to make something better:
function typeName(value) {
if (typeof(value) !== "object" && !(value instanceof RegExp)) {
return typeof(value);
} else if (value == null) {
return "null";
} else {
var c = value.constructor || {};
return c.name || c.NAME || "Object";
}
}
See here:
https://github.com/cederberg/mochikit/commit/582a51531f68a17aa0ddea41...
I was thinking about including this in MochiKit.Base, possibly
modifying typeMatcher() on the go. That would break backward
compatibility a bit, so the question is if it would be worthwhile?
This is how typeName() works right now:
undefined ==> "undefined"
null ==> "null"
false ==> "boolean"
new Boolean(true) ==> "Boolean"
42 ==> "number"
new Number(42) ==> "Number" [1]
"test" ==> "string"
new String("") ==> "String" [1]
{ a: 1 } ==> "Object" [2]
[1,2,3] ==> "Array"
new Date() ==> "Date"
/\d+/ ==> "RegExp"
new MyClass() ==> "MyClass" [3]
Notes:
[1]: There are two forms of these built-in types, but normally the
"constructor" form is not used much.
[2]: These objects constructor actually point to the Object function,
hence the upper-case initial.
[3]: For this to work, the constructor property must be set and the
constructor function must have either a name or a NAME property.
Cheers,
/Per
