How to quickly clear a JavaScript Object?

Question

With a JavaScript Array, I can reset it to an empty state with a single assignment:

array.length = 0;

This makes the Array \"appear\" empty

Answer 1

Something new to think about looking forward to Object.observe in ES7 and with data-binding in general. Consider:

var foo={
   name: "hello"
};

Object.observe(foo, function(){alert('modified');}); // bind to foo

foo={}; // You are no longer bound to foo but to an orphaned version of it
foo.name="there"; // This change will be missed by Object.observe()

So under that circumstance #2 can be the best choice.