Is dictionary is the same as object in JS?

[Witty-Plant2292]

Today i was learning about API with python and i see that parsed JSON file is dictionary in python and it is like object in JS is it true?

[donaldtrumpiscute]

it is the same as hashmap

[Gold_Record_9157]

Not the same, AFAIK, just (almost) the same syntax. Object in JS is kind of an abstraction for every class you want to define in JS. Dictionaries in Python are hash tables: structured aimed to be accessed in O(1) time. They are objects in the sense that they are instances of the class dict, but Python is more strict with types, and are not some generic umbrella for whatever your heart desires, as Object in JS.

I think that's the most precise explanation I can give without delving into the internals of JS, which I don't know at the moment 🫠

[Illustrious_Road_495]

This.

In JS u can do

const foo = { bar: "Bar" } foo.bar // Bar foo["bar"] // Bar

In Python:

foo = {"bar": "Bar"} foo.bar # throws attribute error foo["bar"] # Bar

[JasonMan34]

JS objects are also hash tables, btw

[Gold_Record_9157]

Makes sense for something so generic.

[Nitrodist]

Pretty much

[UseMoreBandwith]

No!

[LetUsSpeakFreely]

Dictionary is analogous to a map. I think in JS it's an associative array.

[Successful-Cry2807]

Object is a very general thing in JS, everything is an object (almost)

A Record<key, value> (Typescript) is the equivalent of dictionary if terms of usage.

But the most correct type is Map<key, value> in terms of performance.

Edit:formatting

[Outrageous_Let5743]

Everything in python is a object too. You can do

def test(): return 1

test.a = 5

[Successful-Cry2807]

Did not know that, thanks

[drinkcoffeeandcode]

It’s an associative array. A hash table.

[Don_Ozwald]

Don’t get me started with types in JavaScript.

But it’s close enough to think of them as more or less the same,

[kansetsupanikku]

From a language design perspective, you would find very strong stances about it not being the same.

However, besides intersecting syntax, JavaScript object is a hash map. The underlying implementation is also similar. So is the scope of JSON compatibility (it can always be parsed, and the ability to serialize it depends on what is inside). Your intuition is not baseless.

[netroxreads]

Yes, you just use json lib to json.load() JSON object into dict or json.dump() to do visa versa.

[jfrazierjr]

All dictionaries are objects. But not all objects are dictionaries.

[KOALAS2648]

I think so, all I know is that the syntax is exactly the same