Benchmark: dolittle mark - MeasureThat.net

Tests:

typeof
const foo = 123; const bar = typeof foo === "number"; const baz = Boolean(bar)
undefined
const foo = 123; const bar = foo !== undefined const baz = Boolean(bar)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof
undefined

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.

I'll break down the benchmark and explain what's being tested, the different approaches compared, their pros and cons, and other considerations.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark named "dolittle mark". There are two test cases: "typeof" and "undefined".

**Test Cases**

Let's analyze each test case:

1. **"typeof"`**
	* Benchmark Definition:
```javascript
const foo = 123;
const bar = typeof foo === "number";
const baz = Boolean(bar);
```
	* This test case is checking the performance of the `typeof` operator, which returns a string indicating the type of its operand.
	* In this specific case, since `foo` is a number, `bar` will be `"number"`, and `baz` will be `true`.
2. **"undefined"`**
	* Benchmark Definition:
```javascript
const foo = 123;
const bar = foo !== undefined;
const baz = Boolean(bar);
```
	* This test case is checking the performance of the `!` operator (not equal) in combination with the `===` and `!==` operators, as well as the `Boolean()` function.
	* In this specific case, since `foo` is a number, `bar` will be `false`, and `baz` will be `false`.

**Library**

There isn't a specific library mentioned in the provided JSON. However, it's likely that the benchmark is using some internal libraries or frameworks to execute the JavaScript code.

**Special JS Features/Syntax**

None are explicitly mentioned. However, it's worth noting that the use of the `===` and `!==` operators, as well as the `Boolean()` function, is a common syntax in JavaScript.

**Approaches Compared**

The benchmark appears to be comparing three approaches:

1. **Direct Comparison (`typeof`)**
2. **Negated Comparison (`!==`)**

**Pros and Cons**

Here are some pros and cons of each approach:

1. **Direct Comparison (`typeof`):**
	* Pros:
		+ More readable code
		+ Can be more efficient for certain types of data (e.g., strings)
	* Cons:
		+ May be slower due to the overhead of checking the type
2. **Negated Comparison (`!==`):**
	* Pros:
		+ Often faster than direct comparison, as it avoids the need to check the type
	* Cons:
		+ Can lead to more complex and harder-to-read code

**Other Considerations**

When choosing between these approaches, consider the specific use case and performance requirements. If readability is important, direct comparison might be a better choice. However, if speed is crucial, negated comparison might be preferred.

**Alternatives**

Some alternative approaches could include:

* Using `instanceof` instead of `typeof` for type checking
* Employing a more efficient algorithm for checking undefined values (e.g., using a simple null check)
* Considering the use of a specialized library or framework for performance-critical code

Keep in mind that these alternatives might not be as widely supported or well-understood as direct comparison and negated comparison.

Related benchmarks:

dolittle mark (version: 0)

Comparing performance of: typeof vs undefined

Created: 3 years ago by: Guest

Jump to the latest result

typeof

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):