Benchmark: typeof vs hasOwnProperty

Script Preparation code:

var Visitor = {};
Visitor.AuthState = {'fernando': true };

Tests:

hasOwnProperty
if (Visitor) { if (Visitor.AuthState) { if (!Visitor.AuthState.hasOwnProperty(AUTHENTICATED)) { Visitor.AuthState.AUTHENTICATED = 1; } } else { Visitor.AuthState = { 'AUTHENTICATED': 1 }; } } else { var Visitor = { 'AuthState': { 'AUTHENTICATED': 1 } }; }
typeof
if (Visitor) { if (Visitor.AuthState) { if ('number' !== typeof Visitor.AuthState.AUTHENTICATED) { Visitor.AuthState.AUTHENTICATED = 1; } } else { Visitor.AuthState = { 'AUTHENTICATED': 1 }; } } else { var Visitor = { 'AuthState': { 'AUTHENTICATED': 1 } }; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
hasOwnProperty
typeof

Fastest: N/A

Slowest: N/A

Latest run results:

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

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I'll do my best to break down the provided benchmark data and explain what's being tested.

**Benchmark Overview**

The `MeasureThat.net` website provides a platform for testing JavaScript microbenchmarks. The benchmark in question measures the performance difference between two approaches: using the `typeof` operator versus using the `hasOwnProperty` method.

**Test Cases**

There are two test cases:

1. **"hasOwnProperty"`**: This test case checks the performance of accessing the `AUTHENTICATED` property on an object using the `hasOwnProperty` method.
2. **"typeof"`**: This test case checks the performance of accessing the `AUTHENTICATED` property on an object using the `typeof` operator.

**Benchmark Preparation Code**

The preparation code for each test case is as follows:

* For both test cases, a new object `Visitor` is created with an initial `AuthState` property.
* The `hasOwnProperty` test case sets an initial value of `AUTHENTICATED` to 1 on the `AuthState` object only if it already exists. Otherwise, it creates the property and assigns the value.
* The `typeof` test case performs a similar check, but using the `typeof` operator instead.

**Library Usage**

In both test cases, a library is used: `Visitor`. However, there's no indication that this library provides any specific functionality beyond defining the initial state of the `AuthState` object. It's likely that this library is just a custom implementation to simplify the benchmarking process.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes being tested in these benchmarks. Both tests rely on standard JavaScript language features.

**Options Compared**

The two test cases compare the performance of two approaches:

1. Using `typeof` operator
2. Using `hasOwnProperty` method

Both methods aim to achieve the same result: accessing and initializing the `AUTHENTICATED` property on an object.

**Pros and Cons of Each Approach**

* **`typeof` operator**:
	+ Pros:
		- Often faster than `hasOwnProperty`, since it's a built-in operator.
		- Less memory-intensive, as it only accesses the type hint of the variable.
	+ Cons:
		- May not work correctly for primitive values (e.g., numbers) if they have the same type hint as objects (e.g., number = 42).
* **`hasOwnProperty` method**:
	+ Pros:
		- Works correctly even for primitive values, since it only checks if a property exists on the object.
	+ Cons:
		- May be slower than `typeof`, since it involves a property lookup.

**Considerations**

When choosing between these approaches, consider the specific use case and performance requirements. If speed is crucial and the value being accessed is a primitive type, using `typeof` might be a better choice. However, if the value being accessed can be an object and you want to ensure correct behavior for all types, using `hasOwnProperty` might be a safer bet.

**Other Alternatives**

If you need to benchmark other approaches or features, here are some alternatives:

* Using different JavaScript operators (e.g., `in`, `instanceof`, etc.)
* Utilizing built-in functions like `Object.prototype.hasOwnProperty()` or `Array.prototype.includes()`
* Implementing custom logic using functions or methods
* Considering the use of alternative programming languages (if applicable)

Related benchmarks:

typeof vs hasOwnProperty (version: 0)

Comparing performance of: hasOwnProperty vs typeof

Created: 6 years ago by: Guest

Jump to the latest result

hasOwnProperty

typeof

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):