Benchmark: String array includes vs if check

Script Preparation code:

var arr = ["alpha", "bravo", "charlie", "delta", "echo", "foxtrot"]
var value = "charlie"
var i = 0

Tests:

Includes
if (arr.includes(value)) { ++i }
If
if (value == arr.includes("bravo")){ ++i } else if (value == arr.includes("foxtrot")){ ++i } else if (value == arr.includes("delta")){ ++i } else if (value == arr.includes("echo")){ ++i } else if (value == arr.includes("alpha")){ ++i } else if (value == arr.includes("charlie")){ ++i }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes
If

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Android 11; Mobile; rv:129.0) Gecko/129.0 Firefox/129.0

Browser/OS: Firefox Mobile 129 on Android

View result in a separate tab

Test name	Executions per second
Includes	12146570.0 Ops/sec
If	1823479.6 Ops/sec

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 to understand what is being tested, compared, and their pros and cons.

**Benchmark Definition**

The benchmark definition represents a JavaScript microbenchmark that measures the performance of two different approaches:

1. **String array includes**: This approach uses the `includes()` method on an array containing string values.
2. **If chain with includes**: This approach uses a series of nested if-else statements to check if the value is included in the array by calling `arr.includes()` multiple times.

**Options Compared**

The two options being compared are:

1. **Directly checking if value exists in arr using includes()**
2. **Using a chain of if-else statements with includes()**

**Pros and Cons**

**Option 1: Directly checking if value exists in arr using includes()**

Pros:

* Simple and straightforward
* Optimized by the JavaScript engine to use a lookup table or other internal optimizations

Cons:

* Requires an array to be defined and initialized before calling `includes()`
* May not perform well for large arrays due to the overhead of creating a lookup table

**Option 2: Using a chain of if-else statements with includes()**

Pros:

* Allows for multiple checks in one statement
* Can be useful for certain use cases where multiple checks are needed

Cons:

* Less efficient than directly checking if value exists in arr using includes()
* More complex and harder to read/maintain due to the nested if-else structure

**Other Considerations**

When deciding between these two approaches, consider the following factors:

* **Array size**: For small arrays (e.g., 5-10 elements), the direct check may be sufficient. For larger arrays (e.g., 1000+ elements), the chained check may be slower due to the overhead of multiple function calls.
* **Frequency of use**: If this code is used frequently in your application, consider optimizing it for performance.

**Libraries and Special Features**

There are no libraries mentioned in the benchmark definition. However, if you're interested in learning more about popular JavaScript libraries that provide similar functionality, some examples include:

* Lodash: Provides a `includes()` function as part of its utility belt.
* Ramda: Offers a `includes()` function for array checking.

As for special JavaScript features or syntax, there are none mentioned in the benchmark definition. If you'd like to learn more about other JavaScript features or syntax, feel free to ask!

**Alternatives**

If you're looking for alternative approaches or optimization techniques, consider the following:

* **Use a Set instead of an array**: Arrays have a lookup time of O(n), while Sets have a constant-time lookup (O(1)) using `includes()`.
* **Memoization**: Consider memoizing the result of repeated includes() calls to reduce overhead.
* **Using a more efficient algorithm**: Depending on the specific use case, you may be able to find a more efficient algorithm for checking if an element exists in an array.

I hope this explanation helps!

Related benchmarks:

String array includes vs if check (version: 0)

Comparing performance of: Includes vs If

Created: 2 years ago by: Guest

Jump to the latest result

Includes

If

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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