The for-in loop is the only cross-browser technique for iterating the properties of generic objects. There’s a bunch of literature about the dangers of using for-in to iterate arrays and when to apply the hasOwnProperty filter, but beyond that, documentation of this ubiquitous construct is surprisingly patchy. This article attempts to fill some gaps, I hope its useful.
Tag: for-in in leftHandSideExpression iterator
JavaScript, JavaScript... 