Benchmark: Map vs Object addx

Script Preparation code:

var map = new Map();
var obj = {};

map.set('a', 5);
obj['a'] = 5;

var i = 0, count = 1000, a;

Tests:

Map
for (i = 0; i < count; i++) { map.set('a', 5); }
Obj
for (i = 0; i < count; i++) { obj['a'] = 5; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map
Obj

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**What is being tested?**

The benchmark compares two approaches: using a `Map` data structure versus an object (`obj`) for storing and retrieving values. Specifically, it measures the performance of these two approaches by iterating 1000 times, adding a single key-value pair each time.

**Options compared:**

* **Map**: A built-in JavaScript data structure that stores key-value pairs in an ordered collection.
* **Object**: A general-purpose data structure that stores key-value pairs in an unordered collection. In this case, it's used as a dictionary or hash table.

**Pros and Cons of each approach:**

* **Map:**
	+ Pros:
		- Fast lookups and insertions due to its internal hash table implementation.
		- Efficient iteration over the entries using `forEach()`, `entries()`, etc.
	+ Cons:
		- Requires an additional object creation, which might incur some overhead.
* **Object:**
	+ Pros:
		- No additional object creation required, as it's a built-in data structure.
		- Simple and easy to use for key-value pairs.
	+ Cons:
		- Slower lookups and insertions compared to `Map`.
		- Iteration over the entries can be slower due to its unordered nature.

**Library and syntax considerations:**

The benchmark does not rely on any external libraries. It uses only built-in JavaScript features, such as `Map` and objects.

No special JavaScript features or syntax are used in this benchmark.

**Other alternatives:**

If you were to compare these two approaches with other data structures, you might consider:

* **Array**: An ordered collection of values that can be accessed by index. While it's not ideal for key-value pairs, it could be used if the value order is important.
* **Set**: A collection of unique values that doesn't allow duplicates. It wouldn't be suitable for this benchmark as it would require re-encoding values.

Keep in mind that these alternatives might change the performance characteristics and usage patterns significantly compared to `Map` and objects.

Related benchmarks:

Map vs Object addx (version: 0)

Lookup of map vs object

Comparing performance of: Map vs Obj

Created: 5 years ago by: Guest

Jump to the latest result

Map

Obj

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):