Learn what the shebang line does in scripts and how to use it with zsh, bash, python, and swift.

A Swift builder pattern that reduces MCP server boilerplate from 50+ lines to just 3.

Configure Swift Package targets with swiftSettings for platform conditionals, upcoming features, and compiler flags.

Two Swift utility functions inspired by Kotlin's scope functions for cleaner object configuration.

Core Swift Package Manager commands for building, testing, cleaning, and managing dependencies.

Understand Swift's remainder operator behavior with negative numbers and why it differs from modulo.

Understand why Swift arithmetic crashes on overflow and how to use overflow operators for wrapping behavior.

Test Linux compatibility of Swift packages locally using act to run GitHub Actions workflows on your Mac.

Restart Claude Code CLI and resume previous sessions with --continue or --resume commands instead of losing context.

Enable HiDPI scaling on 3440x1440 ultrawide monitors using BetterDisplay to fix tiny text on macOS.