What is being tested

MeasuringThat.net provides a platform for comparing the performance of different JavaScript microbenchmarks. In this case, two test cases are being compared: lodash.each and Object.forEach. The benchmark being measured is the execution time of a loop that iterates over an array using each of these methods.

Options compared

The main options being compared are:

1. _.each: This is the Lodash implementation of the .each method, which applies a function to each element in an array.
2. Object.forEach: This is the built-in forEach method on arrays in JavaScript, which also applies a function to each element in an array.

Pros and Cons

_.each (Lodash)

Pros:

• Lodash is a widely-used library that provides a robust set of utilities for functional programming.
• The implementation of .each is likely to be optimized for performance.

Cons:

• It adds extra overhead due to the use of a external library.
• There may be potential issues with caching or memoization.

Object.forEach (Native JavaScript)

Pros:

• This is the native implementation of forEach in JavaScript, which means it's typically faster and more efficient than a third-party library.
• No additional overhead due to using an external library.

Cons:

• May not provide all the same features as Lodash's .each, such as handling edge cases or supporting iterators.

Other considerations

When choosing between _.each and Object.forEach, consider the following factors:

• Performance: If speed is critical, Object.forEach might be a better choice. However, if you need additional functionality beyond basic iteration, Lodash's .each might be more suitable.
• Code readability: Some developers prefer the explicitness of Object.forEach, while others find it less readable due to its reliance on the array prototype.
• Maintainability: If you're using a third-party library like Lodash, you'll need to manage dependencies and potential updates.

Library usage

The test case uses Lodash's implementation of .each. The purpose of this library is to provide a comprehensive set of utility functions for functional programming in JavaScript. In this specific benchmark, it provides an optimized implementation of the .each method that can be used instead of the native forEach method.

Special JS feature or syntax

There doesn't appear to be any special JavaScript features or syntax being used in these benchmarks. The tests focus on measuring the performance difference between two common iteration methods.