Benchmark: join vs string + trim

Script Preparation code:

var A = 'test1';
var B = 'test2'

Tests:

join
var result = [A, B].join(' ');
string + trim
var result = `${A} ${B}`.trim();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
join
string + trim

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 its test cases.

**Benchmark Overview**

The benchmark compares the performance of two approaches for concatenating strings: `join()` method and template literals with `.trim()`. The goal is to determine which approach is faster on modern browsers.

**Script Preparation Code**

The script preparation code defines two variables, `A` and `B`, with string values. These variables are used in both test cases.

**Html Preparation Code**

There is no HTML preparation code provided, which means the benchmark focuses solely on JavaScript performance.

**Test Cases**

There are two test cases:

1. **join**: This test case uses the `join()` method to concatenate the strings `A` and `B` with a space separator.
2. **string + trim**: This test case uses template literals (introduced in ECMAScript 2015) to concatenate the strings `A` and `B`, followed by a `.trim()` call on the resulting string.

**Library**

There is no external library used in this benchmark.

**JavaScript Feature**

The benchmark uses JavaScript features specific to modern browsers:

* Template literals (`${A} ${B}`): This syntax was introduced in ECMAScript 2015 and allows you to embed expressions inside strings.
* `.trim()` method: This method is part of the String prototype and is used to remove whitespace from the beginning and end of a string.

**Pros and Cons**

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

1. **join() method**:
	* Pros: Wide support across browsers, simple syntax.
	* Cons: May not be as efficient as template literals for large strings or complex concatenations.
2. **Template Literals (`${A} ${B}`)**:
	* Pros: Efficient and readable way to concatenate strings, supports expression evaluation (e.g., `${A + B}`).
	* Cons: Requires modern browsers that support ECMAScript 2015+.

**Other Alternatives**

If you wanted to test alternative concatenation methods, you could consider:

1. **String concatenation with `+` operator**: `var result = A + ' ' + B;`
2. **Array.join() method without template literals**: `var result = ['A', 'B'].join(' ');`

However, these alternatives are generally less efficient and less readable than the two tested methods.

**Benchmark Result Interpretation**

The benchmark results show that, on this particular machine (Chrome 111 on Mac OS X 10.15.7), the `string + trim` approach is faster, with approximately 39% fewer executions per second compared to the `join()` method. However, it's essential to note that benchmark results can vary depending on the specific machine, browser version, and system configuration.

As a general guideline, if you're working on a project that requires frequent string concatenation, using template literals with `.trim()` might be a good choice for its readability and performance benefits.

Related benchmarks:

join vs string + trim (version: 0)

Comparing performance of: join vs string + trim

Created: 4 years ago by: Guest

Jump to the latest result

join

string + trim

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):