Let's break down the benchmark and explain what's being tested.

What is being tested?

The benchmark measures the performance difference between two approaches for removing properties from an object in JavaScript:

1. Using the _.omit function from the Lodash library.
2. Using the spread operator ({...obj, prop: undefined}) to create a new object with the same properties as the original object, but with the specified property set to undefined.

Options compared

The two approaches are being compared for their performance differences.

Pros and cons of each approach:

1. _.omit (Lodash library):
   • Pros:
     • Convenient and concise syntax.
     • Well-tested and widely used in the JavaScript community.
   • Cons:
     • May have additional overhead due to the use of a library.
     • Not as intuitive as other approaches.
2. Spread operator ({...obj, prop: undefined}):
   • Pros:
     • Native JavaScript syntax, so no external dependencies are required.
     • Fast and efficient, as it only creates a new object reference.
     • Easy to understand and implement.
   • Cons:
     • May be less convenient than the _.omit function for some users.

Library: Lodash

Lodash is a popular JavaScript library that provides various utility functions for tasks like array manipulation, object processing, and more. The _omit function is part of this library and returns a new object with the specified properties removed from the original object.

Special JS feature or syntax

This benchmark does not use any special JavaScript features or syntax beyond what's commonly used in modern JavaScript development (e.g., ES6+ syntax).

Other alternatives

If you want to remove properties from an object without using the Lodash library, you could also consider:

1. Using Object.keys() and reduce() methods to create a new object with only the desired keys.

const obj = { aa: 'oh', bb: 'my' };
const newObj = Object.keys(obj).reduce((acc, key) => {
  if (key !== 'aa') acc[key] = obj[key];
  return acc;
}, {});

2. Using a library like lodash as an alternative to the spread operator approach.

Keep in mind that these alternatives might have different performance characteristics compared to the Lodash library or the spread operator approach.