Stop Writing `for` Loops in TypeScript. The 2026 Way to Pipeline Data

Book: TypeScript Essentials Also by me: The TypeScript Library — the 5-book collection My project: Hermes IDE | GitHub — an IDE for developers who ship with Claude Code and other AI coding tools Me: xgabriel.com | GitHub You open a file in the orders service you have not touched in two years. There is a function called monthlyRevenueByCategory . It is thirty-two lines. The first eight declare an empty object, an empty array, and three counters. The next twenty are nested if blocks, an early cont