Benchmark: Map get VS Map has get 3

Script Preparation code:

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

Tests:

Map 1
a = map.get(6379);
Map 2
for (i = 0; i < 6379; i++) { a = arr[i] == i; }

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 benchmark definition and test cases.

**Benchmark Definition JSON**

The benchmark measures the performance difference between two ways to retrieve values from a Map data structure in JavaScript:

1. `map.get(index)`: This method returns the value associated with the specified key (in this case, an integer index).
2. `for (i = 0; i < count; i++) { arr.push(map.get(i)) }`: This approach iterates over the indices of the Map and pushes the values to an array.

**Options Compared**

The benchmark compares two approaches:

1. **`map.get(index)`**: Directly retrieves a value from the Map using its index.
2. **`for (i = 0; i < count; i++) { arr.push(map.get(i)) }`: Iterative retrieval**, which iterates over the indices of the Map and pushes the values to an array.

**Pros and Cons**

1. **`map.get(index)`**:
	* Pros: Fast, efficient, and concise.
	* Cons: May not be suitable for large datasets or complex data structures, as it relies on direct indexing.
2. **Iterative Retrieval (for loop)**:
	* Pros: Suitable for large datasets or complex data structures, as it allows iteration over the indices.
	* Cons: Less efficient and more verbose than direct indexing.

**Library and Purpose**

The `Map` data structure is a built-in JavaScript object that stores key-value pairs. It provides methods like `get()`, `set()`, `has()`, and others for manipulating its contents.

In this benchmark, the `Map` object is used to store values at integer indices, and we're comparing two ways to retrieve those values: direct indexing (`map.get(index)`) and iterative retrieval (using a `for` loop).

**Special JS Features/Syntax**

There are no specific JavaScript features or syntax mentioned in this benchmark.

**Other Considerations**

When working with large datasets or complex data structures, it's essential to consider the trade-offs between performance, conciseness, and maintainability. In general:

* Use direct indexing (`map.get(index)`) when you need fast, efficient access to specific values.
* Use iterative retrieval (using a `for` loop) when you need to process or manipulate all values in the dataset.

**Alternatives**

Other alternatives for iterating over a Map's contents include using `Array.from()` and `forEach()`:

```javascript
// Using Array.from()
const arr = Array.from(map.keys()).map(key => map.get(key));

// Using forEach()
arr.forEach(value => {
  // process value
});
```

Keep in mind that these approaches may have different performance characteristics depending on the specific use case.

Related benchmarks:

Map get VS Map has get 3 (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):