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String concatenation vs array join preciselarge
(version: 0)
Comparing performance of:
String concatentation vs Array join
Created:
4 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var str = ""; var i; var sArr = new Array(1000000).fill("String concatenation. ")
Tests:
String concatentation
for (i = 1000000; i > 0; i--) { str += "String concatenation. "; }
Array join
str = sArr.join("");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
String concatentation
Array join
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
9 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0
Browser/OS:
Chrome 141 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=618812" width="100%" height="500px"></iframe>
Array join
86/s
String concatentation
6/s
View exact numbers
Test name
Executions per second
✓
Array join
86 Ops/sec
String concatentation
6 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Overview** The test compares two approaches to concatenate strings: `string concatenation` (also known as `+=`) and `array join`. The goal is to determine which method is more efficient for large numbers of concatenations. **Options Compared** There are two options compared: 1. **String Concatenation**: This approach uses the `+=` operator to append a string to an existing string. 2. **Array Join**: This approach uses the `join()` method on an array of strings, which concatenates them into a single string. **Pros and Cons** **String Concatenation** Pros: * Easy to implement and understand * No additional data structures are required Cons: * Can be slower due to the overhead of creating temporary objects and performing operations on them * May cause memory fragmentation if not used carefully **Array Join** Pros: * Often faster than string concatenation, especially for large datasets * Reduces the risk of memory fragmentation by avoiding manual string concatenation Cons: * Requires additional data structures (arrays) to store intermediate results * Can be less intuitive and harder to understand for some developers In general, array join is a more efficient approach when dealing with large datasets, but it may require more setup and understanding for new developers. **Library Usage** The test uses the `Array.prototype.join()` method, which is a built-in JavaScript function that concatenates all elements in an array into a single string. The purpose of this library is to provide a convenient way to concatenate arrays of strings without having to manually iterate over each element. **Special JS Feature or Syntax** There are no special JavaScript features or syntax used in this benchmark. Both approaches rely on standard JavaScript language constructs. **Other Alternatives** In addition to the two options compared, there are other alternatives for string concatenation: * **Template literals**: Introduced in ECMAScript 2015 (ES6), template literals allow you to embed expressions inside string literals using backticks (`). * **`String.prototype.repeat()` method**: Introduced in ECMAScript 2015 (ES6), the `repeat()` method allows you to repeat a string multiple times. These alternatives can provide even more efficient ways to concatenate strings, but may require more knowledge of advanced JavaScript features. Overall, the benchmark provides a useful comparison between two common approaches to string concatenation, highlighting the benefits and drawbacks of each.
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