Benchmark: Array includes vs string indexOf

Script Preparation code:

var o = {'ff1234567890121':0, 'ff1234567890122':1, 'ff1234567890123':2, 'ff1234567890124':3, 'ff1234567890125':4};
var a = ['ff1234567890121', 'ff1234567890122', 'ff1234567890123', 'ff1234567890124', 'ff1234567890125'];
var s = '-ff1234567890121--ff1234567890122--ff1234567890123--ff1234567890124--ff1234567890125-';
var t = 'ff1234567890124';

Tests:

Array includes
var i = a.includes(t);
String indexOf
var i = s.indexOf('-' + t + '-');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array includes
String 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):

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Let's break down the benchmark and its test cases.

**Benchmark Definition**

The provided JSON defines two test cases, each measuring the performance of different approaches to find an element in an array or a string:

1. **Array includes**: Measures the time taken by JavaScript to use the `includes()` method on an array.
2. **String indexOf**: Measures the time taken by JavaScript to use the `indexOf()` method on a string.

**Options Compared**

In both test cases, only two approaches are compared:

*   Manual loop-based approach (not explicitly shown in the benchmark definition)
*   Built-in method-based approach (`includes()` or `indexOf()`)

**Pros and Cons of Different Approaches**

### Array Includes

*   **Manual Loop-Based Approach**
    *   Pros:
        *   Can be optimized for specific use cases or performance-critical code.
        *   Can be more straightforward to understand and implement for developers familiar with loops.
    *   Cons:
        *   Requires manual iteration over the array elements, which can be slower and less efficient than built-in methods.
*   **Built-in Method-Based Approach (`includes()`)**
    *   Pros:
        *   Faster and more efficient than manual loop-based approach.
        *   Generally easier to use and understand for developers familiar with modern JavaScript features.
    *   Cons:
        *   May not be as flexible or customizable as a manual loop-based approach.

### String indexOf

*   **Manual Loop-Based Approach**
    *   Pros:
        *   Can be optimized for specific use cases or performance-critical code.
        *   Can be more straightforward to understand and implement for developers familiar with loops.
    *   Cons:
        *   Requires manual iteration over the string characters, which can be slower and less efficient than built-in methods.
*   **Built-in Method-Based Approach (`indexOf()`)**
    *   Pros:
        *   Faster and more efficient than manual loop-based approach.
        *   Generally easier to use and understand for developers familiar with modern JavaScript features.
    *   Cons:
        *   May not be as flexible or customizable as a manual loop-based approach.

**Library Used**

None of the test cases explicitly mention using any external libraries. However, it's worth noting that the `includes()` method in JavaScript is implemented using an optimized algorithm that relies on certain internal data structures and caching mechanisms.

**Special JS Features or Syntax**

The benchmark definition does not require or utilize any special JavaScript features or syntax beyond what is covered by the standard `includes()` and `indexOf()` methods. If a specific feature were required, it might be necessary to use additional libraries or polyfills to enable its usage in the benchmark.

**Other Alternatives**

If you wanted to add more test cases or explore alternative approaches, some potential options could include:

*   **Regular Expression-Based Approach**: Using regular expressions to search for the target element in an array or string.
*   **Manual Array or String Search Algorithms**: Implementing custom algorithms that iterate over the array or string elements to find the target element, such as a binary search approach.
*   **Other Built-in Methods**: Exploring other built-in methods like `filter()`, `map()`, or `reduce()` for finding an element in an array.

However, these alternatives would likely require significant changes to the benchmark definition and implementation.

Related benchmarks:

Array includes vs string indexOf (version: 0)

Comparing performance of: Array includes vs String indexOf

Created: 3 years ago by: Guest

Jump to the latest result

Array includes

String 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):