Chaining Transformations

Chain multiple array methods to build powerful data pipelines. Filter, transform, and aggregate in a single expression.

Basic Chaining

Real-World Pipeline

Sort in Pipeline

Complex Data Processing

Exercise: Filter and Sum

Exercise: Transform and Sort

Exercise: Full Pipeline

Key Points

• Chain methods: .filter().map().reduce()
• Each method returns a new array (except reduce)
• Order matters: filter early for performance
• Use sort() for ordering before slice()
• Build readable pipelines with line breaks