Iterating on Javascript arrays with the “in” keyword?

Some of the libraries loaded by jsFiddle extend the default prototype of Array, thus it shows these extra functions. JQuery doesn't extend the Array prototype and so you don't see any extra functions.

Thanks! That answers my question. – Grigory Javadyan Aug 19 at 9:02.

This happens because of prototype inheritance. An object doesn't only show its' own properties, but all of its' ancestors properties as well. To find only an object's own properties, use obj.

HasOwnProperty(prop). Var x = 1,2; for (var I in x) { if (x. HasOwnProperty(i)) { document.

Write(xi); } } See MDN Docs on hasOwnProperty.

– Grigory Javadyan Aug 19 at 8:59 +1, definitly the way to correctly iterate over an object. – Exelian Aug 19 at 8:59.

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