> - What about primitives?Are there primitive types and object types? Is the > union of the two called just “types”? > > That seems to be how a lot of folks refer to them, but I think it's a little > confusing. A primitive type is one that cannot be decomposed any further, so > Object is a primitive type, and a Function is an object type.
Almost: a primitive is something that isn’t handled by reference. Object is therefore not a primitive type: var o1 = new Object(); var o2 = o1; o1.foo = 123; console.log(o2.foo); // 123 http://www.2ality.com/2011/03/javascript-values-not-everything-is.html > The only thing I am sure of is that "typeof" is unfortunately named :) I now use the rule of thumb: - typeof: use for primitives and to distinguish primitives from objects. - instanceof: use for objects. Obviously, typeof also works for checking for functions. > You could also say javascript's type lattice is pretty damn degenerate. Can you elaborate? > (I do think structural typing could be really useful but I have no idea how > it could be introduced to the language unobtrusively.) Something like this? var Counter = { inc: "function", data: "number" }; matchesInterface(anObject, Counter); -- Dr. Axel Rauschmayer [email protected] home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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