Benchmark: Includes vs indexof Array

Script Preparation code:

const testArray = [0, 1, 2, 3, 4];

Tests:

Includes
const testArray = [0, 1, 2, 3, 4]; testArray.includes(4)
IndexOf
const testArray = [0, 1, 2, 3, 4]; testArray.indexOf(4) > -1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Includes
IndexOf

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 and its test cases to understand what is being tested.

**Benchmark Overview**

The benchmark measures the performance difference between two JavaScript methods: `includes` and `indexOf` on an array of integers. The test case uses a constant array `[0, 1, 2, 3, 4]`.

**Options Compared**

Two options are compared:

1. **Includes**: This method checks if a specified value (in this case, `4`) exists in the array.
2. **IndexOf**: This method returns the index of the first occurrence of the specified value (in this case, `4`) in the array.

**Pros and Cons**

*   **Includes Method:**
    *   Pros:
        *   Easier to read and understand for many developers, as it clearly conveys the intent of checking if a value exists in an array.
        *   Can be faster than `indexOf` in some cases since it uses a linear search approach.
    *   Cons:
        *   May be slower than `indexOf` when using large arrays or performance-critical code, due to its simpler implementation and lack of optimization.
*   **IndexOf Method:**
    *   Pros:
        *   Can be faster than the `includes` method for large arrays, as it uses a binary search approach under the hood (in modern browsers).
        *   Provides more granular information about the array elements' positions.

**Library and Purpose**

There is no specific library mentioned in this benchmark. However, both methods (`includes` and `indexOf`) are native JavaScript methods that do not require external libraries to function.

**Special JS Features or Syntax**

This benchmark uses some special JavaScript features and syntax:

*   **Template Literals**: The use of template literals (e.g., `\r\n`) in the script preparation code allows for better formatting and readability.
*   **Arrow Function Expressions**: Although not shown explicitly, arrow function expressions are often used in JavaScript code to define small functions. In this case, they could be used as a shorthand for defining the `testArray` array.

**Other Alternatives**

Other alternatives for achieving similar functionality to the `includes` and `indexOf` methods include:

*   **Manual Loop**: You can manually iterate over the array using a loop to check if a value exists.
*   **External Library Functions**: Depending on your specific requirements, you might need to use external libraries (e.g., Lodash) that provide optimized implementations of these functions.

Here is an example of how you could rewrite one test case using a manual loop:

```javascript
function includesManual(array, targetValue) {
    for (let i = 0; i < array.length; i++) {
        if (array[i] === targetValue) {
            return true;
        }
    }
    return false;
}

// Test preparation code
const testArray = [0, 1, 2, 3, 4];
const result = includesManual(testArray, 4);
console.log(result); // Output: True
```

Keep in mind that manual loops are often less efficient and less readable than using native JavaScript methods.

Related benchmarks:

Includes vs indexof Array (version: 0)

Comparing performance of: Includes vs IndexOf

Created: 2 years ago by: Guest

Jump to the latest result

Includes

IndexOf

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):