Benchmark: Map vs Object sum

Script Preparation code:

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

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map sum
Obj sum

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.

Let's break down the provided benchmark and explain what's being tested, compared, and discussed.

**Benchmark Overview**

The benchmark compares the performance of two approaches: using a `Map` data structure versus an object (`obj`) to store and update values. The goal is to calculate the sum of a variable number of values for each approach.

**Approaches Compared**

Two approaches are being tested:

1. **Object Sum**: This approach uses an object (`obj`) with a single key-value pair, where the value is updated incrementally using `obj['a'] = i + obj['a'];`.
2. **Map Sum**: This approach uses a `Map` data structure with a single key-value pair, where the value is updated incrementally using `map.set('a', i + map.get('a'))`.

**Pros and Cons of Each Approach**

Here's a brief summary of the pros and cons of each approach:

* **Object Sum**
	+ Pros: Simple to implement, easy to understand.
	+ Cons: May incur more overhead due to string interpolation (`obj['a']`) and potential issues with key collisions.
* **Map Sum**
	+ Pros: More efficient for large datasets, as `Map` operations are typically faster than object updates. Additionally, `Map` automatically handles key collisions.
	+ Cons: Requires a `Map` data structure, which may not be familiar to all developers.

**Library Used (if applicable)**

In this case, no external libraries are used. However, the use of `Map` and object literals (`var obj = {}`) is part of the standard JavaScript API.

**Special JS Feature/Syntax**

This benchmark does not explicitly test any special features or syntax. The focus is on comparing two straightforward approaches to updating a value in an object versus using a `Map`.

**Other Alternatives**

If you were to create a new benchmark, some alternative approaches you could consider:

* Using a `Set` data structure instead of a `Map`.
* Implementing a custom data structure or algorithm for the sum calculation.
* Comparing performance with different JavaScript engines (e.g., V8 vs. SpiderMonkey).

For this specific benchmark, the main alternatives are simply using an object instead of a `Map`, or exploring alternative sum calculation algorithms.

Let me know if you'd like me to clarify anything!

Related benchmarks:

Map vs Object sum (version: 0)

Sum values on map vs object

Comparing performance of: Map sum vs Obj sum

Created: 3 years ago by: Guest

Jump to the latest result

Map sum

Obj sum

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):