Benchmark: loop vs map 1994

Script Preparation code:

   var map = [];
    for (var i = 0; i < 20; i++) {
      map[i] = true;
    }
  
   var arr = [];
    for (var i = 0; i < 20; i++) {
      arr.push(i);
    }

Tests:

map
for (var i = 0; i < 20; i++) { const t=(map[i]==true) ; }
arr
for (var i = 0; i < 20; i++) { const t=arr.indexOf(i)>=0 ; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
map
arr

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 and explain what is being tested.

**Benchmark Overview**

The benchmark measures the performance difference between using `map()` and `indexOf()` (or equivalent) for looping over an array in JavaScript. The test cases use two arrays, `map` and `arr`, which are initialized with 20 elements each.

**Options Compared**

Two options are compared:

1. **Using `map()`**: This approach uses the `map()` function to create a new array with the same number of elements as the original array, but only includes the boolean values from the map.
2. **Using `indexOf()` (or equivalent)**: This approach uses the `indexOf()` method (or equivalent) to find the index of each element in the array, and then checks if the value at that index is true.

**Pros and Cons**

* Using `map()`:
	+ Pros:
		- More concise and readable code
		- Creates a new array with the desired values, which can be useful for further processing
	+ Cons:
		- Creates a new array, which can lead to performance overhead if not necessary
		- May consume more memory
* Using `indexOf()` (or equivalent):
	+ Pros:
		- More efficient than creating a new array with `map()`
		- Does not consume additional memory
	+ Cons:
		- Code is longer and less readable
		- May not be as concise as using `map()`

**Library and Special JS Features**

There are no libraries used in this benchmark. However, the test cases use special JavaScript features:

* **Array methods**: The benchmark uses modern array methods like `map()` and `indexOf()`, which are part of the ECMAScript standard.
* **Arrow functions**: The benchmark uses arrow functions (`const t=(map[i]==true)`) to define small, anonymous functions.

**Other Considerations**

The benchmark measures the performance difference between these two approaches in terms of executions per second (ExecutionsPerSecond). This metric is useful for understanding how quickly each approach can process a large number of iterations. However, it's essential to note that this benchmark only considers the pure computational overhead and does not take into account other factors like memory usage or code readability.

**Alternatives**

Other alternatives for looping over arrays in JavaScript include:

* **For loops**: Traditional loops using `for` statements can be more verbose but still effective.
* **Reduce() method**: The `reduce()` method can be used to iterate over an array, but it's typically used with accumulator functions and has different use cases than `map()` or `indexOf()`.
* **Lodash** (or other utility libraries): Lodash provides a range of utility functions for working with arrays, including those that might be used in similar benchmark scenarios.

In summary, the benchmark measures the performance difference between using `map()` and `indexOf()` (or equivalent) for looping over arrays in JavaScript. While `map()` is more concise and readable, it may lead to performance overhead due to creating a new array. The benchmark provides insights into the trade-offs of these two approaches and can help developers choose the most suitable one depending on their specific use cases and requirements.

Related benchmarks:

loop vs map 1994 (version: 0)

Comparing performance of: map vs arr

Created: 3 years ago by: Guest

Jump to the latest result

map

arr

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):