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Array.prototype.concat.apply vs Array.prototype.concat + spread vs Array.prototype.flat operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat.apply vs Array.prototype.concat + spread operator vs Array.prototype.flat
Created:
5 years ago
by:
Guest
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Tests:
Array.prototype.concat.apply
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = [].concat.apply([], params);
Array.prototype.concat + spread operator
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = [].concat(...params);
Array.prototype.flat
var params = [ [1, 2], [3, 4], [5, 6] ]; var result = params.flat();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Array.prototype.concat.apply
Array.prototype.concat + spread operator
Array.prototype.flat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's break down the provided JSON and benchmark preparation code. **Benchmark Definition** The benchmark definition is to compare three different ways of concatenating arrays in JavaScript: 1. Using `Array.prototype.concat.apply` 2. Using `Array.prototype.concat` with the spread operator (`...`) 3. Using the new `Array.prototype.flat` operator The goal is to see which method is the fastest for a given input. **Individual Test Cases** There are three test cases, each representing one of the methods mentioned above: 1. **Array.prototype.concat.apply**: This method uses the `apply` function to call the `concat` method on an empty array (`[]`). The `params` array (which contains sub-arrays) is passed as arguments to the `concat` method using `apply`. The resulting flattened array is stored in the `result` variable. 2. **Array.prototype.concat + spread operator**: This method uses the spread operator (`...`) to pass the `params` array (which contains sub-arrays) directly to the `concat` method on an empty array (`[]`). The resulting flattened array is stored in the `result` variable. 3. **Array.prototype.flat**: This method uses the new `flat` operator to flatten the `params` array (which contains sub-arrays). The resulting flattened array is stored in the `result` variable. **Library and Special JS Features** No external libraries are used in these test cases. However, the spread operator (`...`) is a special JavaScript feature introduced in ECMAScript 2015 (ES6) that allows an expression to be expanded into individual elements. The `flat` operator is also a special JavaScript feature introduced in ECMAScript 2019 (ES9) that allows an array to be flattened recursively up to a specified depth. **Pros and Cons** Here's a brief summary of the pros and cons of each method: 1. **Array.prototype.concat.apply**: This method has been around for a while and is widely supported. However, it can be slower than other methods, especially for large inputs. 2. **Array.prototype.concat + spread operator**: This method is faster than `concat.apply` and more concise to write. However, the spread operator might not be supported in older browsers or environments. 3. **Array.prototype.flat**: This method is the fastest of the three and is specifically designed for flattening arrays. However, it's a newer feature that might not be supported in older browsers or environments. **Other Alternatives** If you don't need to flatten arrays recursively, you can also use `Array.prototype.map` and `Array.prototype.concat` together to achieve similar results. However, this method is generally slower than the `flat` operator. Another alternative is to use a library like Lodash's `flatten` function, which provides a more robust and customizable way of flattening arrays. However, using a library might not be necessary if you're only working with flat arrays or small inputs.
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