mirror of
https://github.com/kjanat/livedash-node.git
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Kaj Kowalski
cd05fc8648
- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills) - Change typescript to tsx for code blocks with JSX - Replace ellipsis (...) in array examples with valid syntax - Separate CSS from TypeScript into distinct code blocks - Convert JavaScript object examples to valid JSON in docs - Fix enum definitions with proper comma separation
33 lines
768 B
Markdown
33 lines
768 B
Markdown
---
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title: Combine Multiple Array Iterations
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impact: LOW-MEDIUM
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impactDescription: reduces iterations
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tags: javascript, arrays, loops, performance
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---
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## Combine Multiple Array Iterations
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Multiple `.filter()` or `.map()` calls iterate the array multiple times. Combine into one loop.
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**Incorrect (3 iterations):**
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```typescript
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const admins = users.filter((u) => u.isAdmin);
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const testers = users.filter((u) => u.isTester);
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const inactive = users.filter((u) => !u.isActive);
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```
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**Correct (1 iteration):**
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```typescript
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const admins: User[] = [];
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const testers: User[] = [];
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const inactive: User[] = [];
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for (const user of users) {
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if (user.isAdmin) admins.push(user);
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if (user.isTester) testers.push(user);
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if (!user.isActive) inactive.push(user);
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}
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```
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