Benchmark: Map get VS Map has get 2

Script Preparation code:

var i = 0, count = 10000, a;
var map = new Map();

for (i = 0; i < count; i++) {
  if (Math.random() > 0.5) {
    map.set(i, i * i);
  }
}

Tests:

Map 1
a = map.get(5489);
Map 2
if (map.has(5489)) { a = map.get(5489); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Map 1
Map 2

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and explain what is tested, compared options, pros and cons, library usage, special JS features or syntax, and other considerations.

**Benchmark Definition**

The benchmark measures the performance difference between two approaches:

1. `map.get(5489)` : This approach uses the `get` method to retrieve a value from the Map instance.
2. `if (map.has(5489)) { ... } map.get(5489);`: This approach first checks if the key exists using `has`, and then retrieves the value using `get`.

**Options Compared**

The two approaches are compared in terms of performance.

**Pros and Cons**

1. **`map.get(5489)`**:
	* Pros: Simple, concise, and efficient.
	* Cons: If the key is not present, it will return `undefined`, which might be considered a false positive for the benchmark.
2. **`if (map.has(5489)) { ... } map.get(5489);`**:
	* Pros: Provides more accurate results by checking if the key exists before attempting to retrieve the value.
	* Cons: More verbose and slightly less efficient due to the additional check.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition. However, since it involves a Map instance, the `Map` class from the JavaScript standard library is used.

**Special JS Features or Syntax**

None are explicitly mentioned, but the use of `has` and `get` methods on a Map instance implies that modern JavaScript versions (ES6+) are being tested.

**Other Considerations**

* The benchmark creates a large Map instance with 10,000 entries to ensure significant performance differences can be observed.
* The script preparation code initializes the Map instance and populates it with random data, which may affect the results depending on the specific use case.
* The test cases are designed to measure the performance of each approach under different conditions (e.g., key presence).

**Alternatives**

If alternatives were needed or desired, some possible approaches could include:

1. Using `Object.getPrototypeOf()` and `hasOwnProperty` instead of `map.has()`.
2. Implementing a custom, optimized `get` method for the Map class.
3. Comparing performance with other data structures, such as an array or object, under similar conditions.

These alternatives would require significant changes to the benchmark definition, script preparation code, and test cases to ensure fair comparisons and accurate results.

Related benchmarks:

Map get VS Map has get 2 (version: 0)

Map get VS Map has get

Comparing performance of: Map 1 vs Map 2

Created: 3 years ago by: Guest

Jump to the latest result

Map 1

Map 2

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):