Benchmark: equals - MeasureThat.net

Script Preparation code:

var a = 1;
var b = 1;

Tests:

Object.is
Object.is(a, b)
a === b
a === b

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.is
a === b

Fastest: N/A

Slowest: N/A

Latest 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 provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined by two test cases: `Object.is(a, b)` and `a === b`. Both tests are designed to measure the performance of JavaScript operators for equality checks.

**What are we testing?**

We're testing two different approaches to perform equality checks:

1. **`Object.is(a, b)`**: This method is part of the ECMAScript standard (ECMA 262) and is designed to provide a more stable and accurate way of comparing values, especially for primitive types like numbers, booleans, and null/undefined values.
2. **`a === b`**: This is a built-in operator in JavaScript that checks if two values have the same value and type.

**Options compared**

The main difference between these two approaches is how they handle floating-point precision errors (FPEs) and other issues related to comparing numbers.

**Pros and Cons:**

* `Object.is(a, b)`:
	+ Pros:
		- More accurate for primitive types due to its handling of FPEs.
		- Can provide better results for equality checks involving NaN (Not a Number).
	+ Cons:
		- May be slower than `a === b` due to the overhead of calling a method.
* `a === b`:
	+ Pros:
		- Faster and more concise, as it's just an operator call.
	+ Cons:
		- May not accurately handle FPEs or NaN values.

**Other considerations:**

* The choice between these two approaches depends on the specific use case. For most purposes, `a === b` is sufficient and faster. However, if you need precise equality checks for numbers or want to avoid potential FPE issues, `Object.is(a, b)` might be a better choice.

**Library usage:**

In this benchmark, there's no explicit library mentioned, but the use of `Object.is(a, b)` implies that JavaScript's built-in object model is being tested. No external libraries are required or mentioned in the provided code snippets.

**Special JS feature or syntax:**

There's no special JavaScript feature or syntax explicitly used in these test cases. However, it's worth noting that the benchmark is run on a browser (Chrome 108), which might imply some optimizations or features specific to browsers.

**Other alternatives:**

If you're looking for alternative equality check methods, consider:

* `Number.isFinite(a)` and `Number.isInteger(a)` for checks involving finite numbers.
* `typeof a === 'number'` and `a === NaN` for checking if a value is a number and not NaN, respectively.

Keep in mind that these alternatives might have their own trade-offs in terms of performance or accuracy.

Related benchmarks:

equals (version: 0)

Comparing performance of: Object.is vs a === b

Created: 3 years ago by: Guest

Jump to the latest result

Object.is

a === b

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):