Benchmark: join vs combine - MeasureThat.net

Script Preparation code:


var props = Array.from({length:1000}).fill(0)

Tests:

str combine
let propsNamesString = `[` for (let i = 0, l = props.length; i < l; i++) { propsNamesString += JSON.stringify(props[i]) if (i < l - 1) propsNamesString += ', ' } propsNamesString + `]`
join
let propsNamesString = `[${props.join(', ')}]`

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
str combine
join

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON defines two benchmark tests: "join vs combine". The script preparation code initializes an array `props` with 1000 elements, and the HTML preparation code is empty. This means that both benchmarks will be run on the same JavaScript environment, without any external dependencies or user input.

**Test Cases**

There are two test cases:

1. **"str join"`: This benchmark defines a function that concatenates all elements in the `props` array using the `join()` method.
2. **"str combine"`: This benchmark defines a similar function, but with a custom implementation that concatenates elements manually using string interpolation.

**Options Compared**

The two benchmarks are comparing the performance of two different approaches to concatenate an array of strings:

1. Using the `join()` method, which is a built-in JavaScript method that takes a separator and an array of values as arguments.
2. Using a custom implementation with string interpolation, where each element is concatenated manually using string concatenation (`+=`).

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

**Join() Method**

Pros:

* Faster execution time, since it avoids the overhead of manual string concatenation.
* More concise code.

Cons:

* Less control over the output string (e.g., no ability to insert dynamic values).
* May not be suitable for all use cases, especially when dealing with sensitive data or large amounts of text.

**Custom Implementation**

Pros:

* More flexible and controllable output string.
* Suitable for cases where manual manipulation is necessary.

Cons:

* Slower execution time due to the overhead of manual string concatenation.
* Less concise code.

**Library Usage**

There are no external libraries used in these benchmarks. However, if you were to add libraries like `lodash` or `string-pool`, they could potentially improve performance by providing optimized string manipulation functions.

**Special JS Feature/Syntax**

The benchmarks do not explicitly use any special JavaScript features or syntax. However, it's worth noting that the `join()` method is a part of the ECMAScript standard (section 22.1), which means it should be supported in most modern browsers and environments.

**Other Alternatives**

If you were to explore alternative approaches for concatenating arrays of strings, some options could include:

* Using `Array.prototype.reduce()`: This method applies a callback function to each element in the array, accumulating an output value. While more flexible than `join()`, it may be slower due to the overhead of callback functions.
* Utilizing template literals: Introduced in ECMAScript 2015 (ES6), template literals provide a concise way to concatenate strings with dynamic values.

Overall, the choice between using `join()` and a custom implementation depends on your specific use case and performance requirements. MeasureThat.net provides a valuable platform for comparing these approaches and identifying potential optimization opportunities.

Related benchmarks:

join vs combine (version: 0)

Comparing performance of: str combine vs join

Created: 5 years ago by: Registered User

Jump to the latest result

str combine

join

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):