Benchmark: Map vs Object, numeric key

Script Preparation code:

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

Tests:

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

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 world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The benchmark definition is a JSON object that represents the test case. It contains the following information:

* **Name**: A unique name for the benchmark, which in this case is "Map vs Object, numeric key".
* **Description**: A brief description of the benchmark, which explains that it's a lookup comparison between a Map and an Object.
* **Script Preparation Code**: A snippet of JavaScript code that sets up the test environment. In this case, it creates a new Map and an Object, and assigns a unique key (based on the current timestamp) to both data structures.
* **Html Preparation Code**: An empty string, which means no HTML preparation is required for this benchmark.

**Options Compared**

The two options being compared in this benchmark are:

1. **Map lookup**: The first test case, which uses the `get()` method of a Map object to retrieve a value based on a key.
2. **Object lookup**: The second test case, which uses the bracket notation (`[key]`) to access a property of an Object.

**Pros and Cons**

Both approaches have their advantages and disadvantages:

* **Map lookup**:
	+ Pros: Fast lookups, efficient storage, and automatic key ordering.
	+ Cons: Requires explicit key creation, and may not be suitable for all use cases (e.g., when keys are not unique).
* **Object lookup**:
	+ Pros: Flexible data structure, easy to work with existing code, and no need to create keys explicitly.
	+ Cons: Slower lookups compared to Map, as the browser has to iterate through properties.

**Library**

There is no explicit library mentioned in this benchmark. However, it's worth noting that JavaScript Objects are built-in data structures that can be used for lookup purposes.

**Special JS Feature/Syntax**

This benchmark does not use any special or advanced JavaScript features. It only uses standard JavaScript syntax and semantics.

**Alternatives**

If you're looking to create your own microbenchmarks using MeasureThat.net, here are some alternatives:

1. **MeasureThat.net**: The official benchmarking platform for JavaScript microbenchmarks.
2. **Benchmark.js**: A popular alternative to MeasureThat.net, offering more features and flexibility.
3. **jsperf.com**: A simple and straightforward benchmarking tool for measuring JavaScript performance.

Keep in mind that each of these alternatives has its own strengths and weaknesses, so be sure to explore them thoroughly before choosing the best fit for your needs.

Related benchmarks:

Map vs Object, numeric key (version: 0)

Lookup of map vs object

Comparing performance of: Map lookup vs Obj lookup

Created: 5 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):