Question 1

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

Question 2

Implement memoize() with custom resolver and cache limit

Accepted Answer

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

> **How to read this doc:** the eviction claim — that exceeding `maxSize` genuinely forces a real recomputation on the next access to the evicted key — was verified directly with a real call counter, not just reasoned about from the `Map` insertion-order behavior.

## 1. The problem, restated

`memoize(fn, { resolver, maxSize })` returns a wrapped function that caches `fn`'s results by a

JAVASCRIPT CODINGDECODED.

Medium

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

Implement memoize() with custom resolver and cache limit