Benchmark: Object.is() or ===

Tests:

Object.is()
var foo = 'foo'; var bar = 'bar'; console.log(Object.is(foo, bar));
===
var foo = 'foo'; var bar = 'bar'; console.log(foo === bar);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

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Test case name	Result
Object.is()
===

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript operations can be quite complex, especially when it comes to comparing two different approaches for equality checks.

The main difference between `Object.is()` and `===` lies in their behavior with regards to primitive values, NaN (Not a Number), and objects.

**Primitive Values:** For primitive values like strings, numbers, or booleans, both `Object.is()` and `===` behave the same way. They will return true if the values are equal.

**NaN**: This is where things get interesting. Both `Object.is()` and `===` treat NaN (Not a Number) as unequal, regardless of whether it's used in an expression or assigned to a variable. However, this can lead to false positives for some algorithms that expect NaN to be treated differently under certain conditions.

**Objects**: When comparing objects using `Object.is()`, it will perform a deep equality check. This means that both the keys and values of the two objects must be equal, including any nested objects or arrays. On the other hand, `===` performs a reference check only for primitive types (like numbers, strings, etc.), so if you're comparing object references using `===`, it will return true even if they don't have exactly the same structure or values.

**Library:** There is no specific library being used in this benchmark. It's all about vanilla JavaScript.

Now let's examine some pros and cons of each approach:

- **Object.is():**
  - Pros:
    + More flexible when comparing objects, as it checks both keys and values.
    + Better handling for NaN values (by treating them as unequal).
  - Cons:
    + May return unexpected results in certain algorithms that expect NaN to be treated differently under specific conditions.

- `===`:
  - Pros:
    + Generally more predictable behavior when comparing primitive types.
    + Can be useful in cases where a reference check is required for objects.
  - Cons:
    + Less flexible than `Object.is()` when dealing with objects, as it only checks references.

**Special JS feature:** The benchmark uses the `===` operator. This is not special to this benchmark but rather standard JavaScript syntax.

Other alternatives could be:

- `==` and `!=`: While similar to `===`, these operators perform type coercion before comparison, which can lead to unexpected results in certain situations.
- `Object.compare()`: Some modern browsers (including Chrome) have an internal `Object.compare()` method that provides a more flexible way of comparing objects. However, this is not widely supported and may require careful consideration when writing code that needs to work across different browsers.

In summary, choosing between `Object.is()` and `===` depends on the specific requirements of your use case. If you're working with objects or need to handle NaN values carefully, `Object.is()` might be a better choice. However, if you're dealing primarily with primitive types and prefer a more straightforward comparison, `===` could be sufficient.

Related benchmarks:

Object.is() or === (version: 0)

Comparing performance of: Object.is() vs ===

Created: 7 years ago by: Guest

Jump to the latest result

Object.is()

===

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):