Benchmark: charAt vs split - MeasureThat.net

Script Preparation code:

var digits = '06325112733';

Tests:

charAt
let sum = 0; var digitsLength = digits.length; for (let i = 0; i < digitsLength; ++i) { var digit = +digits.charAt(i); sum += digit * (digitsLength + 1 - i); } var lastSumChecker = sum % 11; var checker = lastSumChecker < 2 ? 0 : 11 - lastSumChecker; return checker;
split
let sum = 0; var digitsLength = digits.length; sum = digits.split('').reduce((prev, curr, index) => { var current = +curr; return prev + current * (digitsLength + 1 - index); }, 0); var lastSumChecker = sum % 11; var checker = lastSumChecker < 2 ? 0 : 11 - lastSumChecker; return checker;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
charAt
split

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Purpose**

The benchmark is designed to compare two approaches for calculating a specific mathematical sum using a given string of digits: `charAt` (using the `charCodeAt()` method) and `split` (using the `split()` method). The goal is to determine which approach performs better in terms of execution speed.

**Options Compared**

There are two options being compared:

1. **charAt**: This approach uses the `charAt()` method to extract individual characters from the string and then multiplies each character by its corresponding position in the string, summing them up.
2. **split**: This approach uses the `split()` method to split the string into an array of individual characters and then uses the `reduce()` method to calculate the sum.

**Pros and Cons**

*   **charAt**:
    *   Pros:
        +   May be faster for short strings due to the overhead of creating an array with `split()`.
        +   Uses a more traditional approach, which might be easier to understand.
    *   Cons:
        +   May be slower for large strings due to the need to repeatedly call `charAt()` and create intermediate variables.
*   **split**:
    +   Pros:
        +   Can handle very long strings efficiently without creating intermediate arrays or variables.
        +   Uses a more modern approach, which might be considered more "JavaScript-ish".
    *   Cons:
        +   May be slower for short strings due to the overhead of creating an array with `split()`.
        +   Requires understanding of the `reduce()` method.

**Library and Special JS Features**

There is no explicit library mentioned in this benchmark. However, it does utilize some special JavaScript features:

*   **`charCodeAt()`**: This method is used to get the Unicode code point for a one-character string.
*   **`split()`**: This method is used to split a string into an array of substrings based on a specified separator (in this case, no separator is provided).
*   **`reduce()`**: This method is used to apply a function to each element in the array and reduce it to a single value.

**Other Alternatives**

Some alternative approaches that could be considered for calculating the same sum include:

*   **Using `Array.prototype.map()` and `Array.prototype.reduce()`**: This approach would avoid creating an array with `split()` and instead map over the individual characters, then use `reduce()` to calculate the sum.
*   **Using a simple loop with indexing**: This approach would use a traditional loop with manual indexing to extract each character from the string and calculate the sum.

**Benchmark Results**

The latest benchmark results show that:

*   The `split` approach outperforms the `charAt` approach, with approximately 38% fewer executions per second.
*   The Chrome 119 browser on a Mac OS X 10.15.7 device performs slightly better than other browsers or devices.

Overall, this benchmark provides valuable insights into the performance differences between two common approaches to calculating mathematical sums in JavaScript, highlighting the trade-offs between traditional and modern methods.

Related benchmarks:

charAt vs split (version: 0)

Comparing performance of: charAt vs split

Created: 5 years ago by: Guest

Jump to the latest result

charAt

split

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):