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# Array Methods in JavaScript## Problem
Need to manipulate arrays efficiently without mutations.
## Solution
const numbers = [1, 2, 3, 4, 5];
const doubled = numbers.map(x => x * 2);
const filtered = numbers.filter(x => x > 3);
## When to Use- Data transformation in React components
- Processing API responses
- Building data pipelines
## Related Notes
[[JavaScript Functional Programming]] | [[React State Management]]
## Video References- [Array Methods Explained](video-link) - 12:34 timestamp
- [Performance Comparison](video-link) - 8:45 timestamp
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/Python/
├── /Core-Syntax/
├── /Web-Frameworks/ → Links to /JavaScript/Node-Frameworks/
├── /Data-Science/ → Unique to Python
└── /Common-Patterns/ → Links to similar patterns in other languages
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