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(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
spread operator vs concat
Created:
5 years ago
by:
Guest
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Tests:
spread operator
var params = [ "hello", true, 7 ] var other = [...params].map(param => Number.parseInt(param));
concat
var params = [ "hello", true, 7 ] var other = [].concat(params).map(param => Number.parseInt(param));
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Suite status:
<idle, ready to run>
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Test case name
Result
spread operator
concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
gemma2:9b
, generated one year ago):
This benchmark compares two ways to transform an array of mixed data types into an array of numbers: * **Spread Operator (`...`)**: This ES6 feature allows you to expand the elements of an array directly into another array or expression. * Benchmark definition: `[...params].map(param => Number.parseInt(param));` * **`concat()` Method**: A traditional JavaScript method that joins two or more arrays together, resulting in a new array. * Benchmark definition: `[].concat(params).map(param => Number.parseInt(param));` Both approaches ultimately achieve the same goal: iterating through an array (`params`) containing strings (`"hello"`), a boolean (`true`), and a number (`7`), and converting each element into a number using `Number.parseInt()`. **Pros and Cons:** * **Spread Operator:** * **Pro:** More concise and readable syntax, often considered more modern and expressive. * **Con:** Requires understanding of ES6 features. * **`concat()` Method:** * **Pro:** Widely supported in older browsers (although it's becoming less common to target very old browsers). * **Con:** Verbose syntax compared to the spread operator. **Other Considerations:** The benchmark measures "Executions Per Second" which indicates how efficiently each method processes the array transformation. A higher number means faster execution. **Alternatives:** While this benchmark focuses on specific methods, there are other ways to achieve this transformation: * **`map()` with a For Loop:** You could manually iterate through the array and convert elements using `Number.parseInt()`. * **Functional Programming Libraries:** Libraries like Lodash or Ramda offer optimized functions for array manipulation, potentially offering performance gains. Let me know if you have any more questions about this benchmark or JavaScript array manipulation in general!
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