How do immutable collections improve code predictability in JavaScript

Immutable collections in JavaScript improve code predictability by ensuring that data structures cannot be modified once created. This principle enhances predictability in several ways:

1. Prevents Unexpected State Changes

Immutable collections guarantee that their state remains consistent throughout the application's execution. This predictability makes it easier to reason about the code, as developers can rely on the fact that data will not change unexpectedly. For instance, when working with complex state management systems like Redux, immutability ensures that state updates are explicit and trackable, reducing the likelihood of bugs due to unintended state modifications.

2. Simplifies Debugging

Debugging becomes more straightforward with immutable data structures. Since data cannot be altered, any changes must be explicitly tracked by creating new versions of the data. This process helps developers identify where and when changes occur, making it easier to pinpoint and fix issues.