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Comment by snek | Hacker News Reader

  obj = Object.create(null)
  obj = {}

is exactly the same as

  obj = {}

I would also do `Object.keys().forEach()`.

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It’s not. The null version won’t have methods like hasOwnProperty etc.

If it wasn’t clear, i was mentioning 2 ways of initializing, not that you should reassign immediately.

I see a lot of people accessing a map/dictionary using the “for (key in)” pattern, not realizing they are inheriting any method/prototype names along with their basic dictionary they’ve defined. Using Object.create(null) is an easy way to not only save memory, but reduce issues if using dynamic key names.

https://stackoverflow.com/questions/500504/why-is-using-for-...

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