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BS test isEmpty
(version: 1)
Comparing performance of:
_.isEmpty(window.foo1); vs Array.isArray(window.foo1) && window.foo1.length === 0 vs window.foo1?.length === 0
Created:
5 years ago
by:
Registered User
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HTML Preparation code:
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>
Script Preparation code:
// empty array window.foo1 = []; // array of strings window.foo2 = ['a', 'b', 'c', 'd', 'e']; // array of objects window.foo3 = [{ a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }, { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }, { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } }];
Tests:
_.isEmpty(window.foo1);
_.isEmpty(window.foo1);
Array.isArray(window.foo1) && window.foo1.length === 0
Array.isArray(window.foo1) && window.foo1.length === 0
window.foo1?.length === 0
window.foo1?.length === 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
_.isEmpty(window.foo1);
Array.isArray(window.foo1) && window.foo1.length === 0
window.foo1?.length === 0
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 break down the benchmark and explain what is being tested. **Benchmark Overview** The benchmark, hosted on MeasureThat.net, tests three different ways to check if an array is empty in JavaScript. The array in question, `window.foo1`, is initialized as an empty array. The test cases compare the performance of three methods: 1. Using Lodash's `isEmpty` function 2. Using a traditional array length check with `Array.isArray` and indexing 3. Using a null-safe operator (`?.`) to access the `length` property **Test Cases** The three individual test cases are: 1. `_.isEmpty(window.foo1);` * This test case uses Lodash's `isEmpty` function to check if the array is empty. 2. `Array.isArray(window.foo1) && window.foo1.length === 0` * This test case uses a traditional approach to check if the array is empty by checking its type and length using `Array.isArray` and indexing into the array. 3. `window.foo1?.length === 0` * This test case uses a null-safe operator (`?.`) to access the `length` property of the array. If the array is not defined, the expression will short-circuit and return `false`, avoiding a potential TypeError. **Library: Lodash** The benchmark includes a reference to Lodash (a popular JavaScript utility library) in the HTML preparation code: ```html <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script> ``` Lodash's `isEmpty` function is used by test case 1 to check if an array is empty. **Null-Safe Operator (`?.`)** The null-safe operator (`?.`) was introduced in ECMAScript 2020 (ES12) and allows you to access properties of an object without worrying about null or undefined references. In test case 3, the expression `window.foo1?.length === 0` uses this operator to check if the array is empty. If the array is not defined, the expression will short-circuit and return `false`, avoiding a potential TypeError. **Pros and Cons of Each Approach** Here's a brief summary: * **Lodash's `isEmpty` function**: + Pros: concise and readable code + Cons: requires an external library (Lodash) to be included, which may not be desirable for all use cases * **Traditional array length check**: + Pros: widely supported by most browsers, no additional libraries required + Cons: less concise and readable code, potential for errors if incorrect order of operations is used * **Null-Safe Operator (`?.`)**: + Pros: concise and expressive code, helps avoid null/undefined references + Cons: requires support for ECMAScript 2020 (ES12) or later, may not be supported by older browsers **Other Alternatives** If you're interested in exploring alternative ways to check if an array is empty, here are a few options: * Using the `length` property and checking for 0 (`window.foo1.length === 0`) * Using the `some()` method with a callback function that always returns false (`_.some(window.foo1, () => false)`) * Using the `every()` method with a callback function that always returns true (`_.every(window.foo1, () => true)`)
Related benchmarks:
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isEmpty vs length obj
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isEmpty vs .length benchmark - new
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