reduce questions

`Array.prototype.reduceRight` applies a function against an accumulator and each element of the array from right to left. It is similar to `reduce`, but processes elements in reverse order. 

const arr = [1, 2, 3];
const result = arr.reduceRight((acc, num) => acc + num);
console.log(result); // 6

`Array.prototype.reduceRight` executes a reducer function on each element of the array from right to left, accumulating a single result. It is similar to `reduce`, but processes elements in reverse order. 

const arr = [1, 2, 3];
const result = arr.reduceRight((acc, num) => acc + num, 0);
console.log(result); // 6

`Array.prototype.reduce` executes a reducer function on each element of the array, accumulating a single result. It takes a callback function and an optional initial value, and returns the final accumulated result. 

const arr = [1, 2, 3];
const sum = arr.reduce((acc, num) => acc + num, 0);
console.log(sum); // 6

React's useReducer hook is ideal for managing complex state dependencies by defining a reducer function that handles state transitions based on dispatched actions. It helps keep state logic centralized and predictable, making it easier to manage and debug complex state interactions.

`useReducer` is a hook used in React Native to manage complex state logic in functional components. It works similarly to Redux's reducer, allowing you to manage state transitions through actions. It is useful for managing state that involves multiple sub-values or when the next state depends on the previous one. It provides better performance and clarity for complex state interactions.

A reducer is a pure function that takes the current state and an action as arguments, returning a new state. For instance, a user reducer might handle actions like 'ADD_USER' or 'REMOVE_USER' and return the updated user list.