Code Generation & Feature Building

Generating code with Claude isn't typing. It's specification. You describe the contract, the constraints, the architecture — Claude writes the code. In this lesson you'll learn the prompts that produce production-grade code on the first try.

Learning Objectives

After this lesson, you will be able to:

Use Claude Code to build complete features just by describing what you want in plain English
Apply the vertical slice workflow: backend + frontend + tests all built together in one pass
Generate API endpoints, React components, and database migrations with a single prompt
Write prompts that produce production-quality code with proper types, error handling, and tests

Prerequisites

Before You Start

Review

Why

Why This Matters

Code generation is the core use case -- the majority of Claude Code interactions involve writing new code; mastering this workflow determines how productive you are with the tool every single day
Vertical slices prevent integration bugs -- building backend, frontend, and tests together in one pass ensures everything fits together from the start; this is faster and more reliable than building layers separately and integrating later
Claude Code writes code that matches YOUR project -- unlike generic code generators, Claude Code reads your existing patterns and produces code that looks like you wrote it; it uses your naming conventions, imports from your utilities, and follows your error handling patterns
Build this --> Build a complete CRUD feature (backend API + frontend components + tests) in one Claude Code session using the vertical slice approach

#The Vertical Slice Workflow

This is where Claude Code really shines. Building a complete feature -- backend, frontend, tests -- in a single session is one of the most satisfying experiences in modern development. Once you do it once, you will never go back to the old layer-by-layer approach.

Code Generation & Feature Building

After this lesson, you will be able to:

Before You Start

#The Vertical Slice Workflow

Your Reflection

Continue Learning

Discussion

#Example: Building a Feature End-to-End

#Generating API Endpoints

#Building React Components

#Example: Component Generation Prompt

#Writing Tests Alongside Code

#Real Example: Building a Complete Feature

Prompt 1 (Plan)

Prompt 2 (Execute backend/store)

Prompt 3 (Execute frontend)

Prompt 4 (Verify)

Deep Dive

#Key Takeaways

#Quick Check