Benchmark: null & undefined comparison

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var a = null;
var b = undefined;
var c = NaN;
var d = false;
var e = 'a';
var f = 0;

Tests:

_.isNull
_.isNull(a); _.isNull(b); _.isNull(c); _.isNull(d); _.isNull(e); _.isNull(f);
_.isUndefined
_.isUndefined(a); _.isUndefined(b); _.isUndefined(c); _.isUndefined(d); _.isUndefined(e); _.isUndefined(f);
_.isNil
_.isNil(a); _.isNil(b); _.isNil(c); _.isNil(d); _.isNil(e); _.isNil(f);
== null
a == null b == null c == null d == null e == null f == null
=== null
a === null b === null c === null d === null e === null f === null
=== undefined
a === undefined b === undefined c === undefined d === undefined e === undefined f === undefined

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isNull
_.isUndefined
_.isNil
== null
=== null
=== undefined

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 dive into the benchmark and explain what's being tested, compared, and some pros and cons of each approach.

**Benchmark Definition**

The benchmark is designed to compare different ways of checking if a variable is null or undefined. The script preparation code defines six variables: `a`, `b`, `c`, `d`, `e`, and `f`, where:

* `a` is set to `null`
* `b` is set to `undefined`
* `c` is set to `NaN` (Not a Number)
* `d` is set to `false`
* `e` is set to a string `'a'`
* `f` is set to 0

The HTML preparation code includes the Lodash library, which provides utility functions for working with data structures.

**Test Cases**

There are six test cases:

1. `_.isNull(a)`, `_.isNull(b)`, ..., `_.isNull(f)` (using Lodash's `is_null` function)
2. `_.isUndefined(a)`, `_.isUndefined(b)`, ..., `_.isUndefined(f)` (using Lodash's `is_undefined` function)
3. `_.isNil(a)`, `_.isNil(b)`, ..., `_.isNil(f)` (using Lodash's `is_nil` function)
4. `a == null`, `b == null`, ..., `f == null` (using strict equality `==`)
5. `a === null`, `b === null`, ..., `f === null` (using strict equality `===`)
6. `a === undefined`, `b === undefined`, ..., `f === undefined` (using strict equality `===`)

**Options Compared**

The benchmark is comparing the performance of different ways to check if a variable is null or undefined:

* Lodash's `is_null`, `is_undefined`, and `is_nil` functions
* Strict equality operators `==` and `===`

**Pros and Cons of Each Approach**

1. **Lodash's `is_null`, `is_undefined`, and `is_nil` functions**: These functions are designed to provide a more robust way of checking for null or undefined values, as they handle edge cases such as NaN and non-boolean values.
	* Pros: More flexible, handles edge cases
	* Cons: May be slower due to the additional logic
2. **Strict equality operators `==` and `===`**: These operators are simple and fast but can lead to incorrect results if not used carefully (e.g., checking for NaN or non-boolean values).
	* Pros: Fast, simple
	* Cons: May produce incorrect results, requires careful usage

**Library Used**

The Lodash library is used in the benchmark. Lodash provides a set of utility functions that can be used to simplify common data structure operations.

**Special JS Feature or Syntax**

None of the test cases use any special JavaScript features or syntax beyond what's standard in modern browsers.

**Other Alternatives**

If you wanted to write your own benchmarks for this scenario, you could also consider using:

* ES6 template literals (e.g., `a ?? null` or `a || false`)
* The `Optional Chaining Operator` (`?.`) (e.g., `a?.toString()`)
* The `nullish Coalescing Operator` (`??`) (e.g., `x ?? y`)

Keep in mind that these alternatives may have different performance characteristics and are not directly comparable to the Lodash functions or strict equality operators.

Related benchmarks:

null & undefined comparison (version: 0)

Comparing performance of: _.isNull vs _.isUndefined vs _.isNil vs == null vs === null vs === undefined

Created: 4 years ago by: Guest

Jump to the latest result

_.isNull

_.isUndefined

_.isNil

== null

=== null

=== undefined

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):