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Native Undefined vs Lodash isUndefined
(version: 0)
Comparing performance of:
Native vs Lodash
Created:
6 years ago
by:
Registered User
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HTML Preparation code:
<script src='https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js'></script>
Script Preparation code:
var undefinedArray = undefined;
Tests:
Native
typeof undefinedArray === 'undefined'
Lodash
_.isUndefined(undefinedArray)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Native
Lodash
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation. The provided JSON represents a benchmark test between two approaches: using JavaScript's native `typeof` operator to check if a variable is undefined, and using the popular utility library Lodash to perform the same check via its `isUndefined` function. **Native Approach** In this approach, we're simply checking if a variable `undefinedArray` exists in memory by using the `typeof` operator. The native JavaScript `typeof` checks if the value is of a certain type (including `undefined`, `number`, `string`, etc.). If `undefinedArray` does not exist, it returns `'undefined'`. Pros: * Native code runs with minimal overhead and no additional dependencies. * Fastest possible execution because no extra library load time. Cons: * Not all JavaScript environments provide a reliable result for `typeof undefined` as it can return `'number'` if `undefinedArray` is null or an empty array. **Lodash Approach** In this approach, we're using the Lodash library to perform the check. Specifically, we're calling the `isUndefined` function from the Lodash library and passing `undefinedArray` as an argument. Pros: * Provides a reliable result regardless of the JavaScript environment. * Can handle cases where `undefinedArray` might be null or an empty array. * Uses existing library code that is well-tested and optimized. Cons: * Adds extra library load time, which can impact performance in some cases. * Requires including Lodash library as a dependency, which may not be ideal for smaller projects. **Special Considerations** In this benchmark, the `undefinedArray` variable is assigned the value of `undefined`. This is an edge case, as in JavaScript, when you declare a variable without initializing it, its value will be `undefined`, but if you reassign it to `undefined`, it remains `undefined`. The Lodash approach correctly handles this case, while the native approach may produce unexpected results. **Other Alternatives** If you don't want to use Lodash or prefer a more lightweight alternative, you could consider using other utility libraries that provide similar functionality. Some examples include: * `is-unknown` library: Provides a simple and efficient way to check if a value is unknown (i.e., undefined). * `is-inluided` library: Similar to Lodash's `isUndefined`, but may be more lightweight depending on your use case. * Implementing the check manually without using any libraries, which can result in slightly slower performance and potentially less reliable results. Keep in mind that these alternatives might not provide the exact same reliability or optimization as Lodash, so consider their trade-offs when deciding how to proceed with your benchmark.
Related benchmarks:
Lodash isEmpty vs native .isArray + length
lodash isUndefined vs typeof === undefined (take 2)
isUndefined
lodash.isUndefined vs native check is undefined
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