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.filter(Boolean) vs .filter(e => e)
(version: 0)
Comparing performance of:
Boolean vs e => e
Created:
4 years ago
by:
Guest
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Tests:
Boolean
[undefined, null, 1, 0, ""].filter(Boolean);
e => e
[undefined, null, 1, 0, ""].filter(e => e);
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Suite status:
<idle, ready to run>
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Test case name
Result
Boolean
e => e
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **What is tested?** The provided benchmark tests two approaches to filter out `undefined`, `null`, and empty strings from an array: 1. `.filter(Boolean)`: This method uses the boolean value conversion rule, where `false` is converted to 0 and any other value (including `undefined` and `null`) is converted to 0. When applied to an array, it filters out elements that are either `false`, `undefined`, or `null`. 2. `e => e`: This is an arrow function that takes each element `e` as input and returns `e`. When used with the `filter()` method, it effectively ignores any non-truthy values (i.e., `false`, `undefined`, and `null`) in the array. **Options compared** The benchmark compares these two approaches: * `.filter(Boolean)`: This approach uses a more concise and arguably faster way to filter out falsy values. * `e => e`: This approach provides more explicit control over the filtering logic, but may be slightly slower due to the arrow function overhead. **Pros and Cons** Here are some points to consider for each approach: `.filter(Boolean)` Pros: * Concise syntax * Potentially faster execution Cons: * May not be immediately clear what it's doing (requires understanding of boolean value conversion) * May lead to unexpected behavior if used incorrectly `e => e` Pros: * More explicit and readable filtering logic * Less likely to lead to unexpected behavior due to incorrect usage Cons: * Slightly slower execution due to the arrow function overhead * Requires more code to achieve the same result **Library and syntax considerations** In this benchmark, there is no external library used. The arrow function (`e => e`) is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). **Other alternatives** If you need to filter out falsy values from an array, here are some alternative approaches: * `Array.prototype.filter.call()` with a callback function: `arr.filter(call)`, where `call` is the callback function. * Using a ternary operator: `[...].filter(e => e ? true : false)` * Using `Array.prototype.every()`: `arr.every(e => e)` Keep in mind that these alternatives may have different performance characteristics and readability trade-offs compared to the `.filter(Boolean)` and `e => e` approaches tested in this benchmark.
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