Benchmark: Array join vs string contat

Tests:

Array join
let values = [] for (let i = 0; i < 1000; ++i) { values.push('Concatenation. ') } values.join('\n')
String concat
value = '' for (let i = 0; i < 1000; ++i) { value += 'Concatenation. ' } value

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array join
String concat

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 benchmark and explore what's being tested, compared, and considered.

**Benchmark Definition**

The benchmark is defined by a JSON object that provides information about the test. Here are the key points:

* **Name**: The name of the benchmark, which is "Array join vs string concat".
* **Description**: A brief description of the test, which compares different ways to build up a string.
* **Script Preparation Code** and **Html Preparation Code**: These fields are left blank, indicating that no preparation code is required for the test.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Array join**: This test case uses an array `values` to store 1000 elements with the string "Concatenation. ". The resulting array is then joined using the `join()` method with a newline character (`\\n`) separator.
2. **String concat**: This test case uses a variable `value` initialized as an empty string. Then, it appends 1000 occurrences of the string "Concatenation. " to the `value` variable using the assignment operator (`+=`). Finally, the resulting value is returned.

**Comparison**

The two test cases compare two different approaches for building up a string:

* **Array join**: This approach uses an array to store intermediate results and then joins them together.
* **String concat**: This approach uses a single variable to accumulate the string values and returns the final result as a string.

**Pros and Cons of Different Approaches**

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

* **Array join**:
	+ Pros: Can be more memory-efficient, especially for large strings, since it avoids creating intermediate string objects.
	+ Cons: May incur overhead due to array operations (e.g., `push()` and `join()`).
* **String concat**:
	+ Pros: Typically faster than array join since it involves fewer operations.
	+ Cons: Can lead to memory issues if the string grows too large, as a new string object is created on each concatenation.

**Library Used**

Neither of the test cases explicitly uses any libraries. However, it's worth noting that modern JavaScript engines (like V8 in Chrome) provide various optimized methods for string operations, including `join()` and assignment operators (`+=`). These optimizations might affect the performance results.

**Special JS Features or Syntax**

There are no special JS features or syntax used in these test cases. They only rely on standard JavaScript language elements.

**Other Alternatives**

To explore alternative approaches, you could consider modifying the benchmark definition to include other string concatenation methods, such as:

* Using a `StringBuilder` object (although this is not directly supported in vanilla JavaScript).
* Implementing a custom loop with manual string manipulation.
* Using a library like Lodash or Underscore.js for string operations.

Keep in mind that these alternatives might alter the benchmark's behavior or results.

Related benchmarks:

Array join vs string contat (version: 0)

Compare different ways to build up a string.

Comparing performance of: Array join vs String concat

Created: 3 years ago by: Guest

Jump to the latest result

Array join

String concat

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):