Benchmark: indexOf vs map 002-30

Script Preparation code:

var array = [];
for (var i=0; i<30; ++i) {
  	array.push('00' + i);
}

function hasWithIndexOf(needle) {
	return array.indexOf(needle) !== -1;
}

var map = {};
array.forEach(item => map[item] = true);

function hasWithMap(needle) {
	return needle in map;
}

Tests:

indexOf
for (var i=0; i<100; ++i) { array.indexOf("404") !== -1; // array.indexOf("000") !== -1; }
map
for (var i=0; i<100; ++i) { const x = "404" in map }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
map

Fastest: N/A

Slowest: N/A

Latest 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 break down the provided benchmark definition and test cases.

**Benchmark Definition JSON**

The provided JSON represents a JavaScript microbenchmark named "indexOf vs map 002-30". It consists of two benchmark definitions:

1. `hasWithIndexOf(needle)`: This function checks if an element with the given `needle` exists in the array using the `indexOf()` method.
2. `hasWithMap(needle)`: This function checks if a key with the given `needle` exists in the object created by mapping over the array.

**Script Preparation Code**

The script preparation code sets up an array of 30 elements, each represented as a string prefixed with "00" and an integer value. Two functions are defined:

* `hasWithIndexOf(needle)`: Returns `true` if the `needle` exists in the array using `indexOf()`, and `false` otherwise.
* `hasWithMap(needle)`: Creates an object `map` by mapping over the array, where each element is a key with value `true`. Then, it checks if the `needle` exists as a key in this map.

**Html Preparation Code**

There is no HTML preparation code provided.

**Individual Test Cases**

The test cases are defined as two separate benchmark definitions:

1. **"indexOf"`**: This function runs 100 iterations of checking if "404" or "000" exists in the array using `indexOf()`. Only the first iteration checks for "404", and the rest check for "000".
2. **"map"`**: This function runs 100 iterations of checking if a key with the given `needle` exists in the map created by mapping over the array.

**Library Used**

In both benchmark definitions, a library is used: none explicitly mentioned but some keywords can be inferred:

* In the `hasWithIndexOf(needle)` function, the `indexOf()` method is used. This is a built-in JavaScript method for finding the index of a value in an array.
* In the `hasWithMap(needle)` function, the `in` operator is used to check if a key exists in the map. This operator is also a part of the JavaScript language.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes explicitly mentioned in these benchmark definitions.

**Pros and Cons of Different Approaches**

Here's a brief analysis of the two approaches:

1. **`indexOf()` method**:
	* Pros: Widely supported, efficient for large datasets.
	* Cons: May be slower for small arrays or when searching for specific values.
2. **`in` operator with map**: 
	* Pros: Efficient for maps and can handle key collisions.
	* Cons: May be slower for large arrays due to the overhead of creating a map.

**Other Considerations**

When choosing between these approaches, consider factors such as:

* Dataset size: For larger datasets, `indexOf()` might be faster, while for smaller datasets, the `in` operator with map might be more efficient.
* Use case: If you're searching for specific values in an array, `indexOf()` might be sufficient. However, if you need to check multiple keys in a map, the `in` operator might be a better choice.

**Alternative Approaches**

Other approaches you could consider include:

1. **Using `Array.prototype.includes()`**: This method is similar to `indexOf()`, but it returns `true` if the element exists anywhere in the array.
2. **Using `Map.prototype.has()`**: This method is specific to maps and checks if a key exists without creating a map.
3. **Using regular expressions**: If you need to search for patterns in strings, using regular expressions might be a suitable alternative.

Keep in mind that these alternatives may have different performance characteristics or use cases, so it's essential to test them thoroughly before making a decision.

Related benchmarks:

indexOf vs map 002-30 (version: 0)

Comparing performance of: indexOf vs map

Created: 2 years ago by: Guest

Jump to the latest result

indexOf

map

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):