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Alex Rivera
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Beginner JavaScript question. I'm sort of spoiled on the dir built-in function from Python. I want to discover the properties/methods of any object in the node.js REPL. I have already seen this question ; the accepted answer fails (in the node REPL) in the simple case of an empty array [] . For example: for(var prop in []){console.log(prop);} # returns undefined, prints nothing [].length # returns 0 Since the for loop does not discover the array's length method, I do not consider that to be proper introspection. So, could someone fill in the blank here: function magic(some_object) { # magic goes here } console.log(magic([])) # should print a list that includes 'length' Or is this simply not possible, or only possible for "user types"?
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