performance - How to efficiently count the number of keys/properties of an object in JavaScript? -

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what's fastest way count number of keys/properties of object? it possible without iterating on object? i.e. without doing

var count = 0; (k in myobj) if (myobj.hasownproperty(k)) count++;

(firefox did provide magic __count__ property, removed somewhere around version 4.)

to in es5-compatible environment, such node, chrome, ie 9+, ff 4+, or safari 5+:

object.keys(obj).length

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