js-cache-function-results

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

Skills
Web development
5

What it does and how to use it

A skill that teaches Claude Code to do web development tasks well. It is packaged knowledge the model uses whenever it is relevant.

Install the skill (command above).
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Install (Claude Code)

mkdir -p .claude/skills/js-cache-function-results && curl -fsSL https://doutorai.pt/data/lib/skills__js-cache-function-results.md -o .claude/skills/js-cache-function-results/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

---
title: Cache Repeated Function Calls
impact: MEDIUM-HIGH
impactDescription: avoid redundant computation
tags: javascript, cache, memoization, performance
---

## 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

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