Benchmark: array join vs toString js

Script Preparation code:

var arr = ['1','2','3','4','5','6','7','8']

Tests:

join
arr.join()
toString
arr.toString()

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 70 runs

join

6.0M/s

toString

5.0M/s

Fastest: join (1.2x faster)

View exact numbers

✓ join: 6,045,089 ops/sec
• toString: 5,019,404 ops/sec

Firefox 13 runs

join

9.9M/s

toString

9.4M/s

View exact numbers

✓ join: 9,878,638 ops/sec
• toString: 9,407,179 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
join
toString

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Mac OS X 10.15.7

View result in a separate tab

join

9.4M/s

toString

7.9M/s

View exact numbers

Test name	Executions per second
✓ join	9,391,962 Ops/sec
toString	7,941,522 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark on MeasurThat.net, which compares the performance of two approaches for joining an array into a string: `arr.join()` and `arr.toString()`. The benchmark aims to determine which method is faster in modern browsers.

**Test Cases**

There are two individual test cases:

1. **`join`**: This test case uses the `join()` method to concatenate all elements of the `arr` array into a single string.
2. **`toString`**: This test case uses the `toString()` method to convert each element of the `arr` array into a string and then concatenates them.

**Options Compared**

The two options being compared are:

*   `join()`: A built-in JavaScript method that takes an iterable (like an array) as an argument and returns a new string with all elements separated by the specified separator (in this case, no separator is provided).
*   `toString()`: A method that converts its arguments to strings.

**Pros and Cons of Each Approach**

### `join()`:

Pros:

*   Often faster due to optimizations in the JavaScript engine.
*   Can be more readable for developers familiar with string concatenation.
*   Does not require explicit type conversions, which can lead to errors if not handled correctly.

Cons:

*   Requires a specific separator (empty string in this case), which might not always be desired.
*   May not work as expected when the array contains non-string elements.

### `toString()`

Pros:

*   Allows for more flexibility in handling different data types within the array.
*   Does not require a specific separator, making it easier to adapt to various use cases.

Cons:

*   Can be slower due to additional overhead from converting elements to strings.
*   Requires explicit type conversions, which can lead to errors if not handled correctly.

**Library Usage**

None of the test cases uses any external libraries. The `arr` array is defined within the benchmark script.

**Special JavaScript Features or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark.

**Other Alternatives**

For joining arrays into strings, other approaches might include:

*   Using a template literal (`[...].join('')`)
*   Utilizing a library like Lodash (with its `join()` function)
*   Employing a custom implementation using a loop and string concatenation

However, these alternatives are not part of the MeasurThat.net benchmark, which focuses on comparing the built-in `join()` method with `toString()`.

array join vs toString js (version: 0)

test

Comparing performance of: `join vs toString`

Created: 5 years ago by: Guest

Go to the latest result

join

toString

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 70 runs

Firefox 13 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

array join vs toString js (version: 0)

test

Comparing performance of: join vs toString

Created: 5 years ago by: Guest

Go to the latest result

join

toString

Historical Performance Data aggregated from 83 community runs

Desktop Results:

Chrome 70 runs

Firefox 13 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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Comparing performance of: `join vs toString`