Benchmark: reduce vs while - MeasureThat.net

Tests:

Reduce
const charOccurances = str => str .split("") .reduce((p, c) => ({ ...p, [c]: (p[c] || 0) + 1 }), {}); console.log(charOccurances('abacgxhetxghxydfbfdrfdbftyjzbbvbvbv'));
while
const charOccurances = (str = "") => { const response = {}; while(str.length !== 0) { const char = str.charAt(); const reg = new RegExp(char, "g"); response[char] = str.match(reg).length; str = str.replace(reg, ""); } return response } console.log(charOccurances('abacgxhetxghxydfbfdrfdbftyjzbbvbvbv'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Reduce
while

Fastest: N/A

Slowest: N/A

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

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I'll break down the provided benchmark and explain what's being tested, compared, and its pros and cons.

**Benchmark Definition**

The benchmark definition provides two test cases:

1. **Reduce**: This test case uses the `reduce()` method to count the occurrences of each character in a string.
2. **While**: This test case uses a while loop to achieve the same result as the Reduce test case.

**Options Compared**

In this benchmark, we have two options compared:

a. **Reduce**: The first option uses the built-in `reduce()` method to process the string. This approach is likely more concise and easier to read.
b. **While**: The second option uses a while loop to manually iterate over the characters in the string.

**Pros and Cons**

**Reduce:**

Pros:

* More concise and readable code
* Built-in method, which means it's optimized for performance

Cons:

* May not be suitable for very large strings due to its memory usage
* Can be slower than a simple loop if the string is too long

**While:**

Pros:

* Suitable for very large strings due to its manual control over memory usage
* Can potentially be faster than `reduce()` for very large strings

Cons:

* More verbose and less readable code
* Requires manual handling of memory, which can lead to errors

**Library Used**

In the "Reduce" test case, there is no explicit library mentioned. However, it's essential to note that the `reduce()` method is a part of the JavaScript Standard Library.

**Special JS Feature or Syntax**

There are two notable features in this benchmark:

* The use of template literals (`str => ...`) and backticks (``) for string manipulation. This is a relatively modern syntax feature introduced in ECMAScript 2015.
* The use of `RegExp` objects (`const reg = new RegExp(char, "g");`). While not specific to this benchmark, it's essential to be aware of the different types of regular expressions and their usage.

**Other Alternatives**

If you were to rewrite these test cases using alternative approaches, some options might include:

* Using a `for...of` loop or an array method like `map()` instead of `while`.
* Utilizing more advanced string manipulation techniques, such as using `String.prototype.split()` and `Array.prototype.reduce()`.
* Considering the use of a library like Lodash, which provides utility functions for common tasks like character counting.

In summary, the Reduce test case uses the built-in `reduce()` method, while the While test case uses a manual loop. The choice between these approaches depends on the specific requirements and constraints of your project.

Related benchmarks:

reduce vs while (version: 0)

Comparing performance of: Reduce vs while

Created: 8 years ago by: Guest

Jump to the latest result

Reduce

while

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):