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jsu

JavaScript utility library for ECMAScript 5.1 (or higher, due to backwards compatibility). See the list of browsers supporting ES5 here.

jsu (read JSU) stands for and provides JavaScript Utilities. It targets older browser versions first unless there is a security risk, missing functionality or poor performance in newer browsers. Explicit support (dedicated code) is not planned for Internet Explorer as Microsoft Edge is its successor.

The features provided by jsu were originally part of the nvc project. Some of these features, such as type checking or timer events can be found in other utility libraries. In case you find these libraries too large as a dependency, or if they require too new JavaScript technologies, among other disadvantages, you can use jsu as a possible fallback. For example, jsu_event.js supports generic and timer events in just a few lines of code. Also note that type checking is need-specific, i.e. not all use cases will accept a boolean object as a boolean, or a numeric string or an infinite number as a number; so even jsu implementation might not be of any help in checking data types.

Overall, jsu is not a substitute for libraries such as jQuery or others with convenient functions like isEqual() performing deep comparison of arbitrary objects.