How does Underscore.js improve code readability and maintainability?

Underscore.js improves code readability and maintainability by providing a set of utility functions that simplify common JavaScript tasks: mapping, filtering, and sorting. The above functions allow the developer to perform complex data manipulations with less lines of code, therefore, the logic is simpler and clearer to read. For example, instead of writing for loops-which could be long-developers can rely on functions like _.map or _.filter and deal with the array handling operations in a direct declarative way.
The fact that most functions of Underscore.js are syntactically consistent helps with readability because in most of the utility functions, you know exactly what you’re going to get. What this does is keeps down cognitive load and makes code much more understandable and maintainable over a long period of time, specially for projects maintainable over large timelines.