'Under the hood, are Javascript objects hash tables? [duplicate]
I was wondering about how Objects are implemented under the hood in Javascript engines (V8, Spidermonkey, etc). Are they really just Hash Tables? If so, how do they handle collisions?
Solution 1:[1]
Take a look at a similar question How does JavaScript VM implements Object property access? and my answer. Here I described the optimization technique used by JS engines and how it affects the key lookup performance. I hope that knowing of these details let you write more efficient JS code.
Solution 2:[2]
One can think of an object as an associative array (a.k.a. map, dictionary, hash, lookup table). The keys in this array are the names of the object's properties.
I found this on MDN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Property_accessors
In JS arrays are associative arrays and objects are also the same. In JS arrays are basically objects with properties as sequential numbers.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | Valeriy Katkov |
| Solution 2 | Arsalan Adeeb |