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reduce.concat() vs flat() - 2lvl only
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
reduce + Array.prototype.concat 2lvl vs Array.prototype.flat 2lvl
Created:
4 years ago
by:
Registered User
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Tests:
reduce + Array.prototype.concat 2lvl
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat 2lvl
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat(2);
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Suite status:
<idle, ready to run>
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Test case name
Result
reduce + Array.prototype.concat 2lvl
Array.prototype.flat 2lvl
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N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and explain what is being tested. **Benchmark Definition** The benchmark is comparing two approaches: `reduce()` with the traditional `concat()` method, and the new ES6 spread operator (`...`) with the `flat()` method. The test cases are specifically designed to compare these two methods at the second level (2lvl) of nesting in arrays. **Options Compared** Two options are being compared: 1. **`reduce()` with `concat()`**: This approach uses the `Array.prototype.reduce()` method to iterate over the array and concatenate each element using `concat()`. The `reduce()` method is called on an accumulator (`acc`) and returns the new concatenated array. 2. **ES6 spread operator (`...`) with `flat()`**: This approach uses the ES6 spread operator (`...`) to flatten the nested array, followed by the `Array.prototype.flat()` method to flatten it further. **Pros and Cons of Each Approach** 1. **`reduce()` with `concat()`**: * Pros: widely supported across browsers and Node.js versions. * Cons: can lead to slower performance due to the concatenation operation. 2. **ES6 spread operator (`...`) with `flat()`**: * Pros: generally faster performance compared to `reduce()` + `concat()`, as it avoids unnecessary concatenations. * Cons: requires modern browsers or Node.js versions that support ES6 features. **Library Used** In the test cases, the `Array.prototype.flat()` method is used, which is a part of the ECMAScript standard and supported by most modern browsers and Node.js versions. The `flat()` method is designed to flatten an array by recursively calling itself until a specified depth (in this case, 2lvl). **Special JS Feature or Syntax** The ES6 spread operator (`...`) used in the second test case introduces a new syntax feature that allows for more concise array manipulation. **Other Alternatives** If you need to compare other approaches, here are some alternatives: * Use `Array.prototype.flat()` with a different depth option (e.g., 1lvl or Infinity) to see how performance changes. * Compare the use of `reduce()` with other iteration methods, such as `forEach()`, `map()`, or `filter()`. * Test the performance of using ES6 spread operator (`...`) with `flat()` versus using a custom implementation. Keep in mind that these alternatives may introduce additional complexity and variations in results due to differences in implementation and browser support.
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