Benchmark: find vs findindex assign

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 1E5) arr[i] = i++;

Tests:

find
const item = arr.find(item => item == 1E5);
findindex assign
const index = arr.findIndex(item => item == 1E5); const item = arr[index];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
find
findindex assign

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.

Measuring performance differences is a crucial aspect of software development, and tools like MeasureThat.net help developers compare the efficiency of various approaches.

**Benchmark Definition**

The provided JSON represents a benchmark definition for two test cases: `find` and `findindex assign`. The script preparation code initializes an array `arr` with 100,000 elements using a while loop, where each element is assigned a unique value. This creates a challenging scenario that tests the performance of various JavaScript methods.

**Options Compared**

Two options are compared in this benchmark:

1. **`find()` method**: This method returns the first element in the array that satisfies the provided condition.
2. **`findIndex()` method + Array indexing**: This approach uses `findIndex()` to find the index of the first element satisfying the condition, and then uses array indexing to retrieve the corresponding value.

**Pros and Cons**

* **`find()` method**:
	+ Pros: Simple, easy to read, and intuitive.
	+ Cons: Can be slower than `findIndex()` + Array indexing due to potential unnecessary iterations if no matching element is found.
* **`findIndex()` method + Array indexing**:
	+ Pros: Can be faster than `find()` when an exact match is required, as it returns the index of the first occurrence, avoiding unnecessary iterations.
	+ Cons: Requires additional steps (index calculation and array lookup) that might increase overhead.

Other considerations:

* **Performance impact**: The performance difference between these two approaches can vary depending on the specific use case, array size, and JavaScript engine used. In this benchmark, `findIndex()` + Array indexing appears to be faster for large arrays.
* **Readability and maintainability**: While readability is not directly related to performance, it's essential to consider code clarity when choosing an approach.

**Library**

In neither of the provided test cases does a library explicitly play a role. However, some JavaScript engines or browsers may have built-in optimizations or features that could influence the results.

**Special JS feature/syntax**

This benchmark doesn't rely on any special JavaScript features or syntax beyond standard ECMAScript 2022.

**Alternatives**

Other approaches to find an element in an array include:

* **`forEach()` method**: This approach would require a callback function, which might increase overhead due to the additional function call.
* **`reduce()` method**: Another option would be to use `reduce()` with an initial value of -1 and a condition that returns 0 when the matching element is found. However, this approach can be less readable and more complex than the two options being compared.

When running benchmarks like MeasureThat.net, it's essential to consider the specific requirements and constraints of your use case and choose the most suitable approach based on factors such as performance, readability, and maintainability.

Related benchmarks:

find vs findindex assign (version: 0)

Comparing performance of: find vs findindex assign

Created: 5 years ago by: Guest

Jump to the latest result

find

findindex assign

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):