Benchmark: Map vs Object 3 - MeasureThat.net

Script Preparation code:

var map = new Map();
var obj = {};

map.set('a', 5);
obj['a'] = 5;

var i = 0, count = 100000, a;

Tests:

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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map lookup
Obj lookup

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition**

The benchmark is designed to compare the performance of looking up values in a `Map` data structure versus an object (`obj`) in JavaScript. The benchmark uses two test cases:

1. "Map lookup"
2. "Obj lookup"

The script preparation code initializes a new `Map` and an empty object, sets a value for each using the `set()` method and the bracket notation, respectively.

**Options Compared**

Two options are compared:

a. **Map**: Using a `Map` to store key-value pairs.
b. **Object**: Using an object literal to store key-value pairs.

**Pros and Cons of Each Approach**

**Map:**

Pros:

* Efficient lookup with O(1) time complexity on average, making it suitable for large datasets.
* Supports multiple values per key (key-value pair).

Cons:

* Requires more memory compared to objects since each value must be stored separately.
* May have additional overhead due to the map's internal implementation.

**Object:**

Pros:

* Lightweight and efficient in terms of memory usage, as only keys are stored.
* Simple and widely supported syntax.

Cons:

* Lookup time complexity is O(1) on average but can be slower for large datasets due to object lookup algorithms.
* Does not support multiple values per key (key-value pair).

**Other Considerations**

* **Library Usage**: Neither the `Map` nor object operations rely on external libraries. However, it's essential to note that some implementations may use libraries or frameworks to enhance performance.
* **Special JS Features/Syntax**: The benchmark does not test any special JavaScript features or syntax beyond standard language support.

**Alternatives**

If you were looking for alternative benchmarks for comparing `Map` and object lookups, consider:

1. Using a different data structure like an array or set for comparison.
2. Implementing custom hash tables or other optimized data structures for efficient lookups.
3. Utilizing benchmarking frameworks that provide additional features and analysis beyond simple benchmarking.

These alternatives can help you explore more in-depth performance optimizations or edge cases specific to your use case.

Keep in mind that the choice of data structure ultimately depends on your application's requirements, constraints, and performance needs.

Related benchmarks:

Map vs Object 3 (version: 0)

Lookup of map vs object

Comparing performance of: Map lookup vs Obj lookup

Created: 3 years ago by: Guest

Jump to the latest result

Map lookup

Obj lookup

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):