Benchmark: split vs charAt - MeasureThat.net

Script Preparation code:

var digits = '06325112733';

Tests:

charAt
let sum = 0; for (let i = 0; i < digits.length; ++i) { sum += +digits[i] }
split
let sum = 0; sum = digits.split('').reduce((prev, curr) => { return prev + +curr; }, 0)
split 2
let sum = 0; sum = Array.prototype.reduce.call( digits, (prev, curr) => { return prev + +curr; }, 0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
charAt
split
split 2

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 explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of three approaches for calculating the sum of digits in a string: using `charAt`, splitting the string into an array and then reducing it, and using the `Array.prototype.reduce()` method directly on the string.

**Options Being Compared**

1. **`charAt`**: This approach uses the `charAt()` method to extract individual characters from the string and then adds them up.
2. **Split + Reduce**: This approach splits the string into an array of individual characters using the `split('')` method, and then reduces the array to sum its elements using the `reduce()` method.
3. **Reduce on String**: This approach uses the `Array.prototype.reduce()` method directly on the string, without splitting it first.

**Pros and Cons**

1. **`charAt`**:
	* Pros: Simple and easy to understand. No additional memory allocation required.
	* Cons: Can be slower due to the overhead of repeatedly calling `charAt()` and converting the result to a number using unary `+`.
2. **Split + Reduce**:
	* Pros: More efficient than `charAt` since it avoids repeated conversions. However, splitting the string creates extra memory allocation.
	* Cons: Requires creating an intermediate array, which can be memory-intensive for large strings.
3. **Reduce on String**:
	* Pros: Avoids the need to create an intermediate array and reduces memory allocation compared to Split + Reduce.
	* Cons: Can be slower due to the overhead of calling `reduce()` on a string.

**Library Usage**

None of the approaches use any external libraries beyond the built-in JavaScript methods (`Array.prototype.reduce()`, `split('')`, `charAt`).

**Special JS Feature or Syntax**

The benchmark uses the `+` operator for implicit coercion, which converts a string to a number. This is not specific to modern JavaScript versions and has been supported since ES5.

**Other Alternatives**

If you were to compare these approaches without `reduce()`, you could also use:

1. **`split('')` followed by a simple loop**: This would achieve similar results to the Split + Reduce approach but with more manual memory management.
2. **Using `Array.from()` and `reduce()`**: This approach creates an array from the string and then reduces it, which might be slightly slower than the Reduce on String method due to the overhead of creating an intermediate array.

In summary, the benchmark provides a good comparison of three approaches for calculating the sum of digits in a string: using `charAt`, splitting and reducing, and reducing directly on the string. The choice of approach depends on the specific requirements, such as memory allocation or performance considerations.

Related benchmarks:

split vs charAt (version: 0)

Comparing performance of: charAt vs split vs split 2

Created: 5 years ago by: Guest

Jump to the latest result

charAt

split

split 2

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):