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String concatenation vs array join aaaaa
(version: 0)
Comparing performance of:
String concatentation vs Array join
Created:
one year ago
by:
Guest
Go to the latest result
Script Preparation code:
var str = ""; var i; var sArr = new Array(1000);
Tests:
String concatentation
for (i = 1000; i > 0; i--) { str += "S"; }
Array join
for (i = 1000; i > 0; i--) { sArr[i] = "S"; } 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:
one year ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0
Browser/OS:
Firefox 131 on Windows
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<iframe src="https://measurethat.net/Embed?id=565871" width="100%" height="500px"></iframe>
Array join
19K/s
String concatentation
12K/s
View exact numbers
Test name
Executions per second
✓
Array join
18,994 Ops/sec
String concatentation
11,770 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **Benchmark Purpose:** The main goal of this benchmark is to compare two approaches for string concatenation in JavaScript: using the `+` operator (string concatenation) versus using the `join()` method with an array of strings (array join). **Options Compared:** 1. **String Concatenation (`str += "S"`)** 2. **Array Join (`sArr.join("")`)** **Pros and Cons of Each Approach:** **String Concatenation (`str += "S"`):** Pros: * Easy to read and understand * Can be used in a loop to concatenate multiple strings * No need for external libraries or data structures like arrays Cons: * Creates temporary objects on the heap, which can lead to performance issues with large strings * Can cause memory fragmentation due to frequent allocation and deallocation of new strings * May not be suitable for concurrent execution or parallel processing **Array Join (`sArr.join("")`):** Pros: * More efficient than string concatenation, as it avoids creating temporary objects on the heap * Can take advantage of internal optimizations in modern browsers, such as using a single buffer to store all strings * Suitable for concurrent execution or parallel processing due to its thread-safe nature Cons: * Requires an array of strings, which can be less intuitive than string concatenation * May require additional setup and initialization time due to the need to create an array and populate it with data **Library/External Dependencies:** In this benchmark, the only external library used is `Array.prototype.join()`, which is a built-in method in modern JavaScript. **Special JS Features/Syntax:** None mentioned explicitly in the provided information. However, if we were to consider other possible special features or syntax that might be relevant: * None apparent from the provided benchmark definition and test cases. **Other Alternatives:** 1. **`StringBuilder` class:** Some browsers provide a `StringBuilder` class as an alternative for efficient string concatenation. 2. **Template literals (new feature):** Introduced in ECMAScript 2015, template literals offer a more modern and expressive way of string interpolation, which might be relevant for this benchmark. 3. **`String.prototype.repeat()` method:** Another modern JavaScript method that allows repeating strings efficiently. Keep in mind that the choice of approach often depends on the specific use case, performance requirements, and personal preference.
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