Overview

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, providing insight into the performance of different approaches in various browsers.

Benchmark Definition JSON

The provided benchmark definition JSON represents a test case named "Delete vs destructure for objects without mutating pedro". The test aims to measure the performance of two approaches:

1. **"delete obj.a"**: This approach uses the deleteoperator to remove the propertyafrom the objectobj`.
2. "const { a, ...rest } = obj;" : This approach uses destructuring assignment to create a new object rest without modifying the original object.

Options Compared

The two options being compared are:

• Delete: Uses the delete operator to remove a property from an object.
• Destructuring Assignment: Uses destructuring assignment to create a new object without modifying the original object.

Pros and Cons of Each Approach

• Delete:
  • Pros:
    • Simple and straightforward approach
    • Does not require creating a new object or using advanced syntax
  • Cons:
    • Can be slower due to the overhead of the delete operator
    • May have performance implications in certain browsers or situations (e.g., when working with large objects)
• Destructuring Assignment:
  • Pros:
    • More efficient than the delete approach, as it avoids the overhead of creating a new object
    • Can be faster due to the compiler optimizations applied by modern JavaScript engines
  • Cons:
    • Requires understanding and applying the destructuring syntax
    • May not work in older browsers or versions that do not support this feature

Library Usage

The benchmark uses no explicit libraries. It only relies on built-in JavaScript features and standard library functions.

Special JavaScript Features/Syntax

This benchmark utilizes:

• Destructuring Assignment: As mentioned earlier, the benchmark tests the performance of using destructuring assignment to create a new object.
• Delete Operator: The delete operator is used in the first test case to remove a property from an object.

Alternative Approaches

Other alternatives for removing properties from objects without mutating include:

1. Using the Object.defineProperty() method with the configurable and enumerable properties set to false.
2. Using a library like Lodash's deleteProperty() function.
3. Implementing a custom function that iterates over the object's properties and removes them.

However, these alternatives are not typically used in production code due to their complexity or performance implications.