Benchmark: Map vs Object single op

Script Preparation code:

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

Tests:

Map lookup
a = map.get('a');
Obj lookup
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

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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.

The provided JSON benchmark definition represents a simple scenario where two types of data structures, `Map` and `Object`, are used to store a single key-value pair. The goal is to compare the performance of looking up this value using both `Map` and `Object`.

**Comparison Options:**

There are two comparison options:

1. **Map lookup**: This option uses the `Map` data structure to store the key-value pair, and then looks up the value using the `get()` method.
2. **Object lookup**: This option uses an `Object` to store the key-value pair, and then looks up the value using the square bracket notation (`[]`) or dot notation (`.`).

**Pros and Cons:**

1. **Map lookup**:
	* Pros: `Map` provides a fast and efficient way to store key-value pairs using their hash code.
	* Cons: While `Map` is designed for fast lookups, it may incur additional overhead due to its underlying data structure (a hash table).
2. **Object lookup**:
	* Pros: Using an `Object` is more intuitive and easier to read than using a `Map`.
	* Cons: Object lookups can be slower than Map lookups, especially for large datasets.

**Library Used:**

The `Map` data structure used in the benchmark is part of the JavaScript standard library. The `Map` object provides methods like `set()`, `get()`, and `has()` to manipulate its key-value pairs.

**Special JS Feature/Syntax:**

None are mentioned explicitly, but we can assume that the use of the `let` keyword in the script preparation code (`var map = new Map(); var obj = {};`) is a basic JavaScript feature. The use of the `set()` and `get()` methods on the `Map` object also leverages the standard library's built-in functionality.

**Other Alternatives:**

If we were to consider alternative data structures or approaches for this benchmark, some options could be:

* Using an `Array` with an index or a key-value pair using a custom object.
* Utilizing other libraries like Lodash or Ramda, which provide optimized functions for common tasks like lookup.
* Experimenting with different JavaScript engines or versions to see how their optimizations impact performance.

However, for this specific benchmark, the comparison between `Map` and `Object` is likely sufficient to demonstrate the trade-offs in performance.

Related benchmarks:

Map vs Object single op (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):