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Prepack vs Underscore: What are the differences?
What is Prepack? A tool for making JavaScript code run faster (by Facebook). Prepack is a partial evaluator for JavaScript. Prepack rewrites a JavaScript bundle, resulting in JavaScript code that executes more efficiently. For initialization-heavy code, Prepack works best in an environment where JavaScript parsing is effectively cached.
What is Underscore? JavaScript's utility _ belt. A JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects.
Prepack and Underscore can be primarily classified as "Javascript Utilities & Libraries" tools.
Prepack and Underscore are both open source tools. It seems that Underscore with 24.6K GitHub stars and 5.41K forks on GitHub has more adoption than Prepack with 13.7K GitHub stars and 463 GitHub forks.
Fast Healthcare Interoperability Resources (FHIR) provides standard data objects in JSON format for the healthcare industry. Since JSON objects are hierarchical and tree-like, we had a need to defensively 'pluck' fields from our JSON objects and do lots of mapping. We tried jQuery and Underscore and a few other technologies like FHIRPath; but Lodash has been the most well supported, works in the most contexts, has the cleanest syntax, etc. We particularly like the ES6 version of Lodash, where we can import the method names directly, without resorting to * or _ syntax. We got hooked on the 'get' function to defensively pluck fields from objects without crashing our user interface, and have found countless uses for the other lodash functions throughout our apps.
Lodash is great for developing and optimizing algorithms.
Pros of Prepack
- Available as NPM1
- Gulp package available1
- Easy setup but has a very limited range of use cases1
Pros of Underscore
- Utility85
- Simple55
- Functional programming40
- Fast32
- Open source28
- Backbone20
- Javascript16
- Annotated source code8
- Library6
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