Benchmark: angular.isUndefined vs lodash isUndefined vs typeof === undefined fixed

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.2/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.6.1/lodash.min.js"></script>

Script Preparation code:

var foo;

Tests:

angular.isUndefined
if (angular.isUndefined(foo)) { foo; }
lodash.isUndefined
if (_.isUndefined(foo)) { foo; }
Native js
if (foo === undefined) { foo; }
simplify native js
if (!foo) { foo; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
angular.isUndefined
lodash.isUndefined
Native js
simplify native js

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing four different approaches to check if a variable `foo` is undefined:

1. `angular.isUndefined(foo)`
2. `_.isUndefined(foo)` (using Lodash library)
3. `foo === undefined`
4. `!foo` (a simplified native JavaScript approach)

**Library: Lodash**

Lodash is a popular JavaScript utility library that provides a wide range of functions for various tasks, including string manipulation, array operations, and more. The `_isUndefined` function in Lodash checks if a value is undefined or null.

**Native JavaScript Approaches**

The two native JavaScript approaches are:

1. `foo === undefined`: This approach uses the triple equals operator (`===`) to compare the value of `foo` with `undefined`. If they match, it means `foo` is undefined.
2. `!foo`: This approach uses the logical NOT operator (`!`) to negate the value of `foo`. In JavaScript, an empty string or 0 are considered "falsy", so if `foo` is an empty string or 0, `!foo` will be false, and vice versa.

**Comparison**

The benchmark compares the execution performance of these four approaches. The test cases are identical: it checks if `foo` is undefined, and if so, executes a statement (in this case, just the variable `foo`). The results show that:

* `simplify native js` ( approach 4) performs best with an average of approximately 8.3 executions per second.
* `Native js` (approach 2) performs similarly to `simplify native js`, with an average of around 8.5 executions per second.
* `lodash.isUndefined` (approach 1) performs worst, with an average of approximately 8.5 executions per second.
* `angular.isUndefined` (approach 3) performs slightly better than `lodash.isUndefined`, but still lags behind the simplified native JavaScript approach.

**Pros and Cons**

Here's a summary of the pros and cons of each approach:

1. **simplify native js**: Pros: simple, efficient, and widely supported. Cons: may not be as readable or maintainable as other approaches.
2. **Native js**: Pros: similar to `simplify native js`, but with an additional check for 0. Cons: slightly less efficient due to the extra check.
3. **Lodash.isUndefined**: Pros: widely used and well-maintained library. Cons: slower performance compared to native JavaScript approaches.
4. **angular.isUndefined**: Pros: part of a popular framework, so familiar to developers. Cons: slower performance compared to native JavaScript approaches.

**Other Alternatives**

Other alternatives for checking if a variable is undefined include:

* `isNaN(foo)` (not recommended, as it checks if the value is NaN instead)
* `typeof foo === 'undefined'` (slightly more efficient than `foo === undefined`, but less readable)
* `Object.is(undefined, foo)` (not widely supported and may be slower)

Keep in mind that these alternatives have different use cases and trade-offs. The simplified native JavaScript approach (`!foo`) is a good starting point for most use cases.

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser/OS: Chrome 123 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
angular.isUndefined	8025502.5 Ops/sec
lodash.isUndefined	8285686.5 Ops/sec
Native js	8558057.0 Ops/sec
simplify native js	15870846.0 Ops/sec

Related benchmarks:

angular.isUndefined vs lodash isUndefined vs typeof === undefined fixed (version: 0)

Comparing performance of: angular.isUndefined vs lodash.isUndefined vs Native js vs simplify native js

Created: 6 years ago by: Guest

Jump to the latest result

angular.isUndefined

lodash.isUndefined

Native js

simplify native js

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):