4 ms·

Hmm, looking at the source code, you are partially correct. https://github.com/v8/v8/tree/master/src/objects https://github.com/v8/v8/tree/master/src/objects I

• squeaky-clean 8y ago
  That's just how it optimizes their usage under-the-hood, but as far as JS is concerned they are all hash maps. For example, try this: var foo = [1,2,3]; // or `foo = new Array(1,2,3)` also works foo['bar'] = 'test'; console.log(foo); and you get: 0:1 1:2 2:3 bar:"test"
• arghwhat 8y ago
  Ah yes, I had forgotten about Typed Arrays, which is a terrible name for what is in fact a buffer view. The entire arraybuffer/typedarray system was a later (≥IE10 if I am not mistaken?) hack added to make up for the fact that Array and Number are super inefficient for data processing. But regardless of them being a bandaid, you are correct that it is an exception. ArrayBuffer and all its views count 10 types in total, so were they the only exception? If so, I believe my point still stands.