Js Cache Function Results

---
name: js-cache-function-results
description: Cache Repeated Function Calls. Use when you need help with js cache function results.
license: CC-BY-NC-SA-4.0
metadata:
  risk: unknown
  source: community
  kind: mode
  category: rules
---

## Cache Repeated Function Calls

Use a module-level Map to cache function results when the same function is called repeatedly with the same inputs during render.

**Incorrect (redundant computation):**

```typescript
function ProjectList({ projects }: { projects: Project[] }) {
  return (
    <div>
      {projects.map(project => {
        // slugify() called 100+ times for same project names
        const slug = slugify(project.name)

        return <ProjectCard key={project.id} slug={slug} />
      })}
    </div>
  )
}
```

**Correct (cached results):**

```typescript
// Module-level cache
const slugifyCache = new Map<string, string>()

function cachedSlugify(text: string): string {
  if (slugifyCache.has(text)) {
    return slugifyCache.get(text)!
  }
  const result = slugify(text)
  slugifyCache.set(text, result)
  return result
}

function ProjectList({ projects }: { projects: Project[] }) {
  return (
    <div>
      {projects.map(project => {
        // Computed only once per unique project name
        const slug = cachedSlugify(project.name)

        return <ProjectCard key={project.id} slug={slug} />
      })}
    </div>
  )
}
```

**Simpler pattern for single-value functions:**

```typescript
let isLoggedInCache: boolean | null = null;

function isLoggedIn(): boolean {
  if (isLoggedInCache !== null) {
    return isLoggedInCache;
  }

  isLoggedInCache = document.cookie.includes("auth=");
  return isLoggedInCache;
}

// Clear cache when auth changes
function onAuthChange() {
  isLoggedInCache = null;
}
```

Use a Map (not a hook) so it works everywhere: utilities, event handlers, not just React components.

Reference: [How we made the Vercel Dashboard twice as fast](https://vercel.com/blog/how-we-made-the-vercel-dashboard-twice-as-fast)