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HeadJS VS Underscore.js

Compare HeadJS VS Underscore.js and see what are their differences

HeadJS

HeadJS is a small library for responsive design, feature detections and resource loading.

Rating
0 reviews
Alternatives Is it good?
Underscore.js

Underscore is a utility-belt library for JavaScript that provides a lot of the functional...

Rating
0 reviews
Pricing
Open source
Alternatives Is it good?
Modelence
Create production-ready applications with zero code sponsored

Which is more popular?

Based on our record, Underscore.js seems to be more popular. It has been mentioned 24 times since March 2021.

social mentions
0 vs 24
Development Tools popularity
3% vs 97%
alternatives listed
26 vs 240+

Base details

Website, pricing, platforms and company facts side by side.

HeadJS
Underscore.js
Website headjs.com underscorejs.org
Pricing —
Open source
Listed in
Development Tools Javascript UI Libraries JavaScript Framework UI +1
Development Tools Javascript UI Libraries JavaScript Framework UI +1

Features and specs

What each product offers, as listed by its team.

HeadJS 4 features
Underscore.js 5 features
  • Improved Page Load Speed
    HeadJS helps in optimizing page load performance by asynchronously loading JavaScript, allowing HTML content to appear faster and improving user experience on initial page load.
  • Simple API
    HeadJS offers a straightforward API, making it easy for developers to implement and manage asynchronous JavaScript loading in their web applications.
  • Enhanced Script Management
    By using HeadJS, developers can manage script dependencies more effectively, ensuring that essential scripts are loaded in the correct order without blocking the rendering of the page.
  • Cross-Browser Support
    HeadJS provides solutions that are compatible across various browsers, thus offering broader compatibility for web applications and addressing differences in how scripts are handled by different browsers.

Possible disadvantages

  • Increased Complexity
    While HeadJS simplifies asynchronous loading, it can introduce complexity to the project setup. Developers need to understand the library and how to implement it correctly, which can be a learning curve.
  • Obsolescence
    With advances in web technology like native async and defer attributes in script tags, HeadJS is becoming less relevant, as similar features are built directly into JavaScript in modern browsers.
  • Dependency
    Using HeadJS adds an additional dependency to your project, which may not be maintained as actively as needed, potentially leading to issues with future web standards.
  • Lack of Developer Support
    HeadJS is not as widely used today as it was in the past, and this can result in a smaller community and less available support compared to more widely adopted tools and libraries.
  • Utility Functions
    Underscore.js provides a wealth of utility functions for common tasks such as map, reduce, filter, and more, making it easier to perform operations on arrays, objects, and collections.
  • Consistency
    The library offers a consistent API, which can make your code more readable and maintainable by providing a standard way to perform common programming tasks.
  • Lightweight
    Underscore.js is lightweight compared to full-featured libraries like Lodash, which can be a benefit if you're looking to minimize your application's footprint.
  • Browser Compatibility
    It supports a wide range of JavaScript environments, making it a good choice for projects that need to work across different browsers and Node.js.
  • Quick to Learn
    Easy to pick up for developers with even a basic understanding of JavaScript, due to its straightforward documentation and familiar function names.

Possible disadvantages

  • Performance
    Underscore.js may not offer the same level of performance optimizations as more modern utility libraries like Lodash, potentially leading to slower execution for some tasks.
  • Limited Functionality
    While it covers many basic utility functions, its feature set is not as extensive as Lodash or other similar libraries, which provide a broader range of capabilities.
  • Outdated
    With the advent of ECMAScript 5 and later versions, many of the functions provided by Underscore.js are now natively available in JavaScript, reducing its necessity.
  • No Modularization
    Underscore does not support modular builds in the same way Lodash does, meaning you might end up including the entire library even if you only need a few functions.
  • Community and Maintenance
    While still maintained, Underscore.js has seen less active development and contributions compared to newer libraries, which could impact its long-term viability and support.

Analysis

An editorial look at what each product does well and who it suits.

HeadJS
Underscore.js

Overall verdict

  • HeadJS was a useful lightweight JavaScript library in the early 2010s for combining feature detection with asynchronous script and CSS loading, but it has since become largely obsolete due to lack of active maintenance and the rise of modern module bundlers, ES6 imports, and native browser loading strategies like async/defer and dynamic import().

Why this product is good

  • Provided a simple API combining feature/browser detection (similar to Modernizr) with async script loading in one small library
  • Helped improve page load performance by loading scripts in parallel while controlling execution order
  • Lightweight footprint compared to using multiple separate libraries for detection and loading
  • Simple, readable syntax that was easy to learn for basic use cases
  • Useful for conditional polyfill loading based on browser capabilities

Recommended for

  • Maintainers of legacy codebases that already depend on HeadJS and need minimal changes
  • Developers studying older approaches to async script loading and feature detection for educational purposes
  • Small, simple static sites without a build process where modern bundlers are not being introduced
  • Not recommended for new projects—modern alternatives like Webpack, Vite, ES modules, or native async/defer attributes are far better supported and maintained today

Overall verdict

  • Underscore.js is a reasonable choice if you need a lightweight library for concise, functional programming helpers. While newer libraries or vanilla JavaScript have made some of its functions less essential, Underscore.js remains useful for its simplicity and comprehensive utility set.

Why this product is good

  • Underscore.js is a popular JavaScript library that provides a comprehensive set of utility functions for common programming tasks. It is valued for its simplicity and ease of integration, especially in projects that require functional programming patterns but do not need the full capabilities of larger libraries like Lodash. Underscore.js is lightweight and can significantly enhance productivity by offering functions for tasks such as object manipulation, array operations, and function binding, making code more readable and maintainable.

Recommended for

    Developers working on smaller projects or legacy codebases that require a reliable utility library with functional programming techniques. It’s also suitable for those who prefer a minimalistic approach and don’t require the extensive features of heavier alternatives.

Videos

Walkthroughs and reviews on video.

HeadJS 0 videos + Add
Underscore.js 1 video + Add

No HeadJS videos yet. You could help us improve this page by suggesting one.

Introduction to Underscore.JS

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
HeadJS
Underscore.js
3% 3%
Development Tools
97% 97%
3% 3%
Javascript UI Libraries
97% 97%
15% 15%
JavaScript Framework
85% 85%
0% 0%
Libraries And Widgets
100% 100%

User comments

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

HeadJS 0 mentions
Underscore.js 24 mentions

Tracking HeadJS since Mar 2021.

  • JavaScript Awesome Package
    Underscore - JavaScript library that provides a whole mess of useful functional programming. - Source: dev.to / 8 months ago
  • JavaScript evolution: From Lodash and Underscore to vanilla
    Underscore was created by Jeremy Ashkenas (the creator of Backbone.js) in 2009 to provide a set of utility functions that JavaScript lacked at the time. It was also created to work with Backbone.js, but it slowly became a favorite among... - Source: dev.to / almost 2 years ago
  • KlongPy: High-Performance Array Programming in Python
    There was a step-change improvement for me when I tried expressing some JS patterns via `underscore.js` instead of procedurally: eg: http://underscorejs.org/#each Thinking of something as `each | map | filter | sum` is waaay less buggy... - Source: Hacker News / almost 2 years ago

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