Generates SVG sparklines from numerical data arrays with support for gradients, custom axis formatting, and time series labels. Self-contained pure function with no external dependencies, making it easily reusable in any project needing simple trend visualization. Demonstrates skill in SVG path generation, gradient handling, and edge case management (single data point duplication).

Implements a custom web component (is-land) for conditional hydration based on visibility, idle state, user interaction, media queries, or save-data settings. Manages fallback content and supports various hydration strategies. Fully self-contained using only browser APIs with no project-specific dependencies. Shows advanced web component patterns including parent synchronization, fallback preservation, and multiple condition handling.

Calculates count, mean, or median for arrays of objects with support for multiple keys and value threshold filtering. Generic utility function operating solely on passed-in parameters with no internal dependencies. Handles edge cases like non-numeric values and empty arrays. Demonstrates clean implementation of statistical operations with flexible input handling.