Looping through empty javascript array returns array object functions?

Get rid of whatever extends Array. Prototype Extending the prototype of default types like Array or Object is bad and causes problems like that The easy way to circumvent issues while keeping the prototype extensions is adding a if(!test. HasOwnProperty(i)) continue check.( obj.

HasOwnProperty(key) is true if the property is on the object itself and not only somewhere in its prototype chain) Besides that, you shouldn't use for..in loops when iterating over arrays - use for(var I = 0; I.

Get rid of whatever extends Array.prototype. Extending the prototype of default types like Array or Object is bad and causes problems like that. The easy way to circumvent issues while keeping the prototype extensions is adding a if(!test.

HasOwnProperty(i)) continue; check. (obj. HasOwnProperty(key) is true if the property is on the object itself and not only somewhere in its prototype chain) Besides that, you shouldn't use for..in loops when iterating over arrays - use for(var I = 0; I Length; i++) in this case.

This works great in cases where the array is associative and you can't for-loop through the keys. Thanks, I learned something new today! – Alice May 1 at 1:30 "associative arrays" are objects in JavaScript - that's why extending Object.

Prototype is also bad. And yes, in this case using for..in is perfectly fine and it actually works without problems and additional code when not extending the prototype. – ThiefMaster May 1 at 9:48.

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