Benchmark: Compare lodash isEmpty and truthy Set.size

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 = new Set(['a', 'b', 'c', 'd', 'e']);

// array of objects
window.foo3 = new Set([{ 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 empty array
_.isEmpty(window.foo1);
size empty array
window.foo1 && window.foo1.size === 0;
isEmpty array of strings
_.isEmpty(window.foo2);
size array of strings
window.foo2 && window.foo2.size === 0;
isEmpty array of objects
_.isEmpty(window.foo3);
size array of objects
window.foo3 && window.foo3.size === 0;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isEmpty empty array
size empty array
isEmpty array of strings
size array of strings
isEmpty array of objects
size array of objects

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its test cases.

**Benchmark Definition JSON**

The provided JSON represents a JavaScript microbenchmarking framework, specifically MeasureThat.net. It defines a benchmark with two parts:

1. **Script Preparation Code**: This section sets up the test environment by creating three arrays: an empty array `window.foo1`, an array of strings `window.foo2`, and an array of objects `window.foo3`. These arrays will be used to test various JavaScript functions.
2. **Html Preparation Code**: This section includes a script tag that loads the Lodash library, which is used in the benchmark.

**Individual Test Cases**

The benchmark consists of six test cases, each defining a different scenario:

1. **isEmpty empty array**: Tests the `_.isEmpty()` function on an empty array.
2. **size empty array**: Tests if an empty array has a length of 0 using the `window.foo1 && window.foo1.size === 0` syntax.
3. **isEmpty array of strings**: Tests the `_.isEmpty()` function on an array of strings.
4. **size array of strings**: Tests if an array of strings has a length of 0 using the same syntax as test case 2.
5. **isEmpty array of objects**: Tests the `_.isEmpty()` function on an array of objects.
6. **size array of objects**: Tests if an array of objects has a length of 0 using the same syntax as test case 2.

**Options Compared**

The benchmark is comparing two approaches:

1. Using Lodash's `_.isEmpty()` function to check for empty arrays and objects.
2. Using the `window.foo` syntax, which checks if an object or array has a certain property or length.

**Pros and Cons of Each Approach**

* **Lodash `_.` approach**:
	+ Pros: Concise and expressive syntax.
	+ Cons: May not be as performance-optimal as native JavaScript alternatives.
* **Window `foo` syntax**:
	+ Pros: Native JavaScript, potentially more performant than Lodash's implementation.
	+ Cons: Requires accessing the global object (`window`) and uses a non-standard syntax.

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides various functions for tasks such as array manipulation, string processing, and more. In this benchmark, Lodash's `_.isEmpty()` function is used to test for empty arrays and objects.

**Special JS Feature/Syntax**

The benchmark uses the `window` object, which is not explicitly mentioned in the specification. However, it's essential to note that accessing global variables like `window` can be considered a non-standard approach.

**Other Alternatives**

If you wanted to write this benchmark without using Lodash or the `window` object, you could use native JavaScript functions, such as:

* `Array.prototype.length`: Instead of checking if an array is empty by verifying its length.
* `Object.keys()`: To check if an object is empty.

Here's a rough example of how you might rewrite test case 2 using native JavaScript:
```javascript
function sizeEmptyArray() {
  const arr = [];
  return arr.length === 0;
}
```
Keep in mind that this implementation may not be as concise or expressive as Lodash's `_.isEmpty()` function, but it would achieve the same result.

Related benchmarks:

Compare lodash isEmpty and truthy Set.size (version: 0)

Comparing performance of: isEmpty empty array vs size empty array vs isEmpty array of strings vs size array of strings vs isEmpty array of objects vs size array of objects

Created: 3 years ago by: Registered User

Jump to the latest result

isEmpty empty array

size empty array

isEmpty array of strings

size array of strings

isEmpty array of objects

size array of objects

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):