Benchmark: JustTheseProps - MeasureThat.net

Script Preparation code:

var refArr = ["a", "b", "c"];


var obj = {
    a : 2,
    b: "3",
    c: "yasss",
    //d: "queen",
}

var keys = Object.keys(obj);

Tests:

includes
const rB = refArr.every(elem => keys.includes(elem)) && keys.length === 3;
set
const s = new Set(keys); const rC = refArr.every(elem => s.has(elem)) && keys.length === 3;
in
const rA = refArr.every(elem => elem in obj) && keys.length === 3;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
includes
set
in

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 dive into the explanation of the provided JSON benchmark.

**Benchmark Definition**

The benchmark is a JavaScript microbenchmark that tests three different approaches to check if all elements in an array are present in an object.

The script preparation code defines two variables:

1. `refArr`: an array containing three string elements: "a", "b", and "c".
2. `obj`: an object with four properties: "a" (with value 2), "b" (with value "3"), "c" (with value "yasss"), and two commented-out properties.

The HTML preparation code is empty (`null`).

**Individual Test Cases**

There are three test cases, each representing a different approach to check if all elements in `refArr` are present in `obj`.

1. **`includes`**: This test case uses the `includes()` method on the `keys` array (which contains the property names of the `obj` object). It checks if every element in `refArr` is included in the `keys` array and if the length of `keys` is 3.
2. **`set`**: This test case creates a new Set object from the `keys` array and uses the `has()` method to check if every element in `refArr` is present in the set. It also checks if the length of `keys` is 3.
3. **`in`**: This test case uses the `in` operator to check if every element in `refArr` is a property name in the `obj` object.

**Library and Purpose**

In none of the provided benchmark definitions, there are libraries being used. However, some libraries might be implicitly used due to built-in JavaScript functionality (e.g., the `Set` object).

**Special JS Features or Syntax**

The benchmarks use the following special features or syntax:

1. **Array methods**: The tests use array methods like `every()`, `includes()`, and `has()` on the `Set` object.
2. **Object properties access**: The tests use property names (e.g., `"a"`) to access values in the `obj` object.

**Pros and Cons of Different Approaches**

Here's a brief analysis of the pros and cons of each approach:

1. **`includes()`**:
	* Pros: Easy to understand, simple implementation.
	* Cons: May be slower due to string search operations.
2. **`set`**:
	* Pros: Faster performance due to set operations, easier to reason about results.
	* Cons: Requires creating a new Set object, which might incur overhead.
3. **`in`**:
	* Pros: Fast and straightforward implementation.
	* Cons: May not be as intuitive or readable for some developers.

**Other Alternatives**

Some alternative approaches to these benchmarks could include:

1. Using `for...of` loops instead of array methods.
2. Using a custom implementation with iterative checks.
3. Adding more test cases to cover other scenarios (e.g., checking for exact matches, handling duplicates).

Keep in mind that the best approach will depend on the specific requirements and use case of your application.

Related benchmarks:

JustTheseProps (version: 0)

JustTheseProps

Comparing performance of: includes vs set vs in

Created: 4 years ago by: Guest

Jump to the latest result

includes

set

in

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):