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Javascript 'concat()' vs '+' for strings
(version: 0)
Benchmark.js
Testing the performance difference between concat() and the + operator for strings in javascript
Comparing performance of:
concat() vs plus_operator
Created:
10 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var string1 = "Hello "; var string2 = " world!";
Tests:
concat()
for(i = 0; i < 1000; i++) { string1.concat(string2); }
plus_operator
for(i = 0; i < 1000; i++) { string1 + string2; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
concat()
plus_operator
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
10 days ago
)
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:155.0) Gecko/20100101 Firefox/155.0
Browser/OS:
Firefox 155 on Linux
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=634012" width="100%" height="500px"></iframe>
plus_operator
751K/s
concat()
108K/s
View exact numbers
Test name
Executions per second
✓
plus_operator
750,662 Ops/sec
concat()
107,981 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what's being tested, the options compared, their pros and cons, and other considerations. **Benchmark Definition** The benchmark is designed to measure the performance difference between two approaches for concatenating strings in JavaScript: using the `concat()` method and using the `+` operator. **Script Preparation Code** The script preparation code defines two string variables, `string1` and `string2`, which are assigned the values `"Hello "` and `" world!"` respectively. This sets up a constant string concatenation scenario where both approaches will be tested. **Options Compared** There are two options being compared: 1. **concat() method**: The `concat()` method is used to concatenate strings by calling it with two arguments, effectively returning a new string that is the combination of the two input strings. 2. **+ operator**: The `+` operator is used for string concatenation, which combines two strings into a single string by concatenating their characters. **Pros and Cons** * **concat() method:** + Pros: - More explicit and readable way to concatenate strings - Less prone to errors due to its more predictable behavior + Cons: - May be slower than the `+` operator for very large strings - Requires an additional function call, which can incur overhead * **+ operator:** + Pros: - Often faster and more efficient for small to medium-sized string concatenations - Simplifies code by eliminating the need for a separate `concat()` method call + Cons: - Can lead to errors if not used carefully (e.g., with null or undefined values) - May be less readable for some developers due to its implicit behavior **Library and Special Features** The benchmark does not use any specific JavaScript libraries, but it does utilize the `String` object's concatenation methods. There are no special JavaScript features or syntax used in this benchmark. **Other Considerations** When evaluating the performance of string concatenation approaches, other factors to consider include: * The size and complexity of the strings being concatenated * The presence of other operations that may impact performance (e.g., loops, conditionals) * The specific browser or environment being tested In general, for small to medium-sized string concatenations, the `+` operator is often a good choice due to its simplicity and efficiency. However, when working with very large strings or in situations where readability and explicitness are crucial, the `concat()` method may be a better option. **Alternatives** If you're interested in exploring other string concatenation approaches or alternatives, some options include: * Using template literals (introduced in ECMAScript 2015) * Utilizing libraries like Lodash's `string union` function * Employing more advanced techniques, such as using a buffer-based approach or leveraging WebAssembly for optimized performance
Related benchmarks
Javascript 'concat()' vs '+'
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