Question 1

Build a Minimal createStore() (Redux-Lite: dispatch, subscribe, reducers)

Accepted Answer

**Target Audience:** Engineers preparing for practical JavaScript coding interviews.
**Difficulty:** Medium

> **How to read this doc:** all 3 real behaviors — correct reducer-driven state updates, subscriber notification on every real dispatch, and a genuinely working unsubscribe that stops FUTURE notifications while state updates continue normally — were verified directly through a real dispatch sequence.

## 1. The problem, restated

A minimal store holds a single piece of state, updated ONLY

Question 2

Implement a Memoized Selector That Only Recomputes When Its Specific Inputs Change (Reselect-Style)

Accepted Answer

**Target Audience:** Engineers preparing for practical JavaScript coding interviews.
**Difficulty:** Medium

> **How to read this doc:** the whole real point of this pattern — genuinely SKIPPING recomputation, verified by checking that the exact SAME array reference is returned, not merely an equal-looking new one — was confirmed directly, not assumed from the caching logic alone.

## 1. The problem, restated

`createSelector(inputSelectors, resultFn)` returns a memoized selector function: each

JAVASCRIPT CODINGDECODED.

Medium

Build a Minimal createStore() (Redux-Lite: dispatch, subscribe, reducers)

Implement a Memoized Selector That Only Recomputes When Its Specific Inputs Change (Reselect-Style)