Benchmark: typeof vs typecast measuring

Script Preparation code:

var number = 0.5625;

Tests:

typeof
typeof number === 'string' && number.includes(':')
string template
`${number}`.includes(':')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof
string template

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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Let's break down the provided benchmark and explain what's being tested, compared, and analyzed.

**Benchmark Definition**

The benchmark is defined by measuring the performance difference between two approaches:

1. Using `typeof var` to check if a variable is of type 'string' when it's not actually a string.
2. Typecasting using template literals (`"${number}"`) with the `.includes(':')` method.

**Options Compared**

The two options are compared in terms of their execution speed, measured in executions per second (FPS).

**Pros and Cons of Each Approach:**

1. **Using `typeof var`:**
	* Pros:
		+ Simple and easy to understand.
		+ No need to worry about template literals or string formatting.
	* Cons:
		+ May be slower due to the overhead of checking the type using `typeof`.
		+ Can lead to unexpected behavior if the variable is not a string, as it will return 'object'.
2. **Typecasting using Template Literals:**
	* Pros:
		+ Often faster than `typeof` due to the optimized parsing and execution of template literals.
		+ Provides better readability and maintainability for complex string formatting.
	* Cons:
		+ Requires knowledge of template literals, which can be unfamiliar to some developers.

**Library Used**

The benchmark uses no external libraries, as it only relies on built-in JavaScript features.

**Special JS Features or Syntax**

None are used in this specific benchmark. However, the use of template literals (`"${number}"`) is a modern JavaScript feature that has become widely supported in recent browsers and versions of Node.js.

**Benchmark Preparation Code**

The script preparation code simply creates a variable `number` with value 0.5625, which is then used in both test cases.

**Individual Test Cases**

There are two test cases:

1. **`typeof`**: Tests if the value of `typeof number === 'string' && number.includes(':')`.
2. **String Template**: Tests if the template literal `${number}` includes the colon (`:`) character.

The benchmark result shows the execution speed (executions per second) for each test case, measured in a Chrome 84 browser on a Windows desktop device.

**Other Alternatives**

If you want to compare these approaches with other methods or libraries, here are some alternatives:

1. **Using `==` or `===`**: Instead of using `typeof`, you could use the equality operator (`==`) or strict equality operator (`===`) to check if a variable is a string.
2. **Regular Expressions**: You could use regular expressions (regex) to match strings and include the colon character, instead of using template literals or the `.includes()` method.
3. **External Libraries**: Depending on your specific use case, you might consider using external libraries like `lodash` or `moment.js` that provide optimized string manipulation functions.

However, for a simple benchmark like this one, built-in JavaScript features and modern browsers should be sufficient.

Related benchmarks:

typeof vs typecast measuring (version: 0)

Testing if performance with typeof var === 'var type string' i better than typecasting.

Comparing performance of: typeof vs string template

Created: 5 years ago by: Guest

Jump to the latest result

typeof

string template

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):