Benchmark: string-interpolation-vs-concatenation with two variables

Script Preparation code:

var luckyNumber = Math.round(Math.random() * 100);
var string = "your lucky number for today is:";

Tests:

string-interpolation
`${string} ${luckyNumber}`
string-concatenation
'your lucky number for today is: ' + luckyNumber

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
string-interpolation
string-concatenation

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
string-interpolation	283858720.0 Ops/sec
string-concatenation	269275232.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):

LLMs can make mistakes. Check important info.

This benchmark compares two approaches to string creation in JavaScript: **template literals** (string interpolation) and **string concatenation**. Both methods combine a static string with a dynamic variable (`luckyNumber`), but they do so in different ways.

### Approaches Being Compared:

1. **String Interpolation** (Template Literals):
   - **Benchmark Definition**: `${string} ${luckyNumber}`
   - **Test Name**: `string-interpolation`
   - **Feature**: This approach utilizes backticks (`` ` ``) to create a template literal, allowing for the embedding of expressions within the string using the `${}` syntax. This is a more modern JavaScript feature introduced in ES6 (ES2015), which makes it easier to create complex strings. 
   - **Pros**:
     - Readability: The syntax is cleaner and more intuitive, especially with multiple variables or expressions.
     - Easier to maintain: Makes it easier to visualize the resulting string and makes code less prone to errors (like missing operators).
   - **Cons**:
     - Older environments (pre-ES6) do not support this feature, necessitating polyfills or transpilers.

2. **String Concatenation**:
   - **Benchmark Definition**: `'your lucky number for today is: ' + luckyNumber`
   - **Test Name**: `string-concatenation`
   - **Feature**: This approach uses the `+` operator to combine strings and variables. It's the traditional way of concatenating strings in JavaScript.
   - **Pros**:
     - Compatibility: This method is supported in all versions of JavaScript, making it safer for use in older environments.
   - **Cons**:
     - Verbose: It can lead to more cumbersome and less readable code, especially with complex strings containing multiple variables.
     - More prone to errors: It's easier to forget an operator or misplace a space.

### Benchmark Results Summary:
The test results illustrate the performance of each approach:
- **String Interpolation Executions Per Second**: 64,497,748.0
- **String Concatenation Executions Per Second**: 58,521,128.0

From these results, we observe that string interpolation is faster than string concatenation under the tested environment (Chrome 134 on Windows). This indicates that newer language features can lead to better performance and should be considered in performance-sensitive applications.

### Other Considerations:
- **Environment**: These benchmarks were conducted in a specific browser with its version. Performance may vary across different environments (e.g., different browsers or devices).
- **Real-World Usage**: While performance is important, the choice between these methods should also consider code readability and maintainability. In many cases, the difference in performance might be negligible compared to the benefits of cleaner and more understandable code.

### Alternatives:
- **String.prototype.concat()**: This is another method for concatenating strings, which utilizes a method of the String object. However, it isn't as commonly used as the "+" operator or template literals.
- **Array.join()**: Joining strings through an array using the `join()` method (`[string, luckyNumber].join(" ")`) can sometimes be useful, particularly for building up complex strings dynamically.
- **StringBuilder patterns**: In scenarios involving multiple concatenations in loops, using an array to collect pieces and then joining them (as mentioned above with `join`) may yield better performance.

In summary, while both string interpolation and string concatenation can achieve similar results in JavaScript, string interpolation generally offers improved performance and readability, making it the preferred choice in modern development scenarios.

Related benchmarks:

string-interpolation-vs-concatenation with two variables (version: 1)

Comparing performance of: string-interpolation vs string-concatenation

Created: one month ago by: Guest

Jump to the latest result

string-interpolation

string-concatenation

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated one month ago):