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Array.prototype.concat vs spread operator nav test
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
7 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark measures the performance difference between two approaches to concatenate arrays in JavaScript: using the `concat()` method (available since ES5) and the spread operator (`...`) introduced in ES6. **Options being Compared** There are two test cases: 1. **Array.prototype.concat**: This uses the traditional `concat()` method to combine the `params` array with another array `[ 1, 2 ]`. 2. **Spread Operator (ES6)**: This uses the spread operator (`...`) to concatenate the `params` array with another array `[ 1, 2 ]`. **Pros and Cons of Each Approach** * **Array.prototype.concat**: Pros: + Widely supported across older browsers and versions. + Can be more readable for some developers due to its explicit nature. * Cons: + Generally slower than the spread operator due to the overhead of method calls and string concatenation. * **Spread Operator (ES6)**: Pros: + Faster and more concise, as it leverages the optimized array handling in modern browsers and engines. + Can be more readable for developers familiar with the syntax. **Considerations** The choice between these approaches depends on: 1. Target audience and compatibility requirements. 2. Performance-critical code or applications where every microsecond counts. 3. Developer preference, given that readability can also impact maintainability. **Library Used** None is explicitly mentioned in this benchmark. **Special JavaScript Features/Syntax** The spread operator (`...`) is a new feature introduced in ES6. It allows for more concise array expansion and concatenation using the syntax `array [...otherArray]`. This feature enables modern browsers to optimize array manipulation, making it generally faster than traditional methods. **Alternatives** For other array concatenation methods, some alternatives include: * **Array.prototype.push()**: Append elements one by one to the end of an array and then return the length of the array. * **String concatenation**: Use `+` operators for string concatenation. Note that this can be less efficient due to the overhead of creating intermediate strings. Keep in mind that these alternatives are not as optimized or readable as using spread operator, which was introduced for its performance and readability benefits. **Benchmark Preparation Code and JSON** The benchmark setup does not require any script preparation code because it is directly provided within the `Benchmark Definition` section.
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