# sway | Fuel Labs | Knowledge Base | Instagit

🌴 Empowering everyone to build reliable and efficient smart contracts.

GitHub Stars: 61.9k

Repository: https://github.com/FuelLabs/sway

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## Articles

### [How to Use `forc update` to Manage Dependencies in Sway](/FuelLabs/sway/how-to-use-forc-update-command-for-dependencies)

Learn to manage Sway project dependencies with forc update. This command finds the latest compatible versions and updates Forc.lock for reproducible builds.

- Tags: how-to-guide
- Published: 2026-03-05

### [How Sway's Inline IR Optimization Pass Improves Performance: A Deep Dive](/FuelLabs/sway/how-sway-inline-ir-optimization-improves-performance)

Discover how Sway's inline IR optimization pass boosts performance by eliminating call overhead and enabling further optimizations. Learn more about this deep dive into FuelLabs/sway.

- Tags: deep-dive
- Published: 2026-03-05

### [How to Write and Run Unit Tests with `forc test` in Sway](/FuelLabs/sway/how-to-write-tests-using-forc-test)

Learn to write and run unit tests in Sway using forc test. Discover how this command compiles and executes your tests on the Fuel VM, providing detailed results.

- Tags: how-to-guide
- Published: 2026-03-05

### [How Sway Handles Storage Read and Write Operations: VM Intrinsics and Type Safety](/FuelLabs/sway/how-sway-handles-storage-read-write-operations)

Discover how Sway handles storage read and write operations using VM intrinsics and type safety for secure blockchain state management. Learn about compile-time slot calculation and purity enforcement

- Tags: internals
- Published: 2026-03-05

### [How to Configure Build Profiles and Optimization Levels in Sway: A Complete Guide](/FuelLabs/sway/how-to-configure-build-profiles-sway)

Learn to configure Sway build profiles and optimization levels in Forc.toml, disabling IR passes for faster builds or enabling full optimizations for production.

- Tags: how-to-guide
- Published: 2026-03-04

### [How to Use ABI Encoding and Decoding for Contract Interaction in Sway](/FuelLabs/sway/how-to-use-abi-encoding-decoding-in-sway)

Learn ABI encoding and decoding in Sway for seamless contract interaction. Sway automatically handles data serialization for calls logs and SDK communication.

- Tags: how-to-guide
- Published: 2026-03-04

### [How Sway's IR Verification Pass Validates Compiled Code: A Deep Dive into the Module Verifier](/FuelLabs/sway/how-sway-ir-verification-pass-validates-code)

Learn how Sway's IR verification pass validates compiled code by checking modules, functions, and instructions for structural integrity and type safety. Get detailed diagnostics before code generation.

- Tags: deep-dive
- Published: 2026-03-04

### [How to Use `forc clean` to Clear Build Artifacts in Sway Projects](/FuelLabs/sway/how-to-use-forc-clean-command)

Learn how to use forc clean to clear build artifacts in Sway projects. Ensure fresh builds by removing compiler generated bytecode and JSON ABIs using this essential command.

- Tags: how-to-guide
- Published: 2026-03-04

### [How Sway's Namespace and Module System Works: A Deep Dive into the Compiler Architecture](/FuelLabs/sway/how-sway-namespace-and-module-system-works)

Explore Sway's namespace and module system. Understand how packages, modules, and scopes create a hierarchical tree for symbol resolution, imports, and visibility in this deep dive into compiler architecture.

- Tags: deep-dive
- Published: 2026-03-04

### [How to Use External Contract Calls in Sway: ABI and Proxy Patterns Explained](/FuelLabs/sway/how-to-use-external-contract-calls-in-sway)

Master external contract calls in Sway using ABI and proxy patterns. Explore typed calls and run_external for efficient bytecode execution and interaction with Fuel smart contracts.

- Tags: tutorial
- Published: 2026-03-04

### [How Sway Type System Performs Type Unification: A Deep Dive into the Compiler](/FuelLabs/sway/how-sway-type-system-performs-type-unification)

Discover how Sway type system performs unification with UnifyCheck and Unifier in sway-core for robust type compatibility and substitution.

- Tags: deep-dive
- Published: 2026-03-04

### [How to Use the forc template Command for Sway Project Scaffolding](/FuelLabs/sway/how-to-use-forc-template-command)

Learn to use the forc template command to scaffold new Sway projects. This tool clones Git repos, extracts files, and updates manifest data for your project.

- Tags: how-to-guide
- Published: 2026-03-04

### [How Sway Handles Method Lookup and Trait Resolution: A Deep Dive into the Compiler Core](/FuelLabs/sway/how-sway-handles-method-lookup-and-trait-resolution)

Explore how Sway handles method lookup and trait resolution. Understand Sway's compiler pipeline for efficient candidate filtering and final selection.

- Tags: deep-dive
- Published: 2026-03-04

### [How to Use Compile-Time Constants and Configurable Values in Sway](/FuelLabs/sway/how-to-use-compile-time-constants-in-sway)

Learn to use compile-time constants and configurable values in Sway. Understand the difference between const and configurable to manage your smart contract settings effectively.

- Tags: how-to-guide
- Published: 2026-03-04

### [How Sway IR Optimization Passes Work: DCE, CSE, and Function Inlining Explained](/FuelLabs/sway/how-sway-ir-optimization-passes-work)

Understand Sway IR optimization passes like DCE CSE and function inlining Learn how these techniques streamline Fuel VM bytecode generation for better performance

- Tags: internals
- Published: 2026-03-04

### [How Sway Derives Auto-Implemented Traits Like Debug and AbiEncode](/FuelLabs/sway/how-auto-implemented-traits-are-derived-in-sway)

Discover how Sway derives auto implemented traits like Debug using Rust macros and AbiEncode via explicit stdlib implementations. Understand Sway's trait derivation.

- Tags: internals
- Published: 2026-03-04

### [How Sway Implements Pattern Matching Exhaustiveness Checking: The Maranget Algorithm Explained](/FuelLabs/sway/how-sway-pattern-matching-exhaustiveness-checking-implemented)

Discover how Sway implements pattern matching exhaustiveness checking using the Maranget algorithm. Learn about pattern matrices and recursive usefulness analysis in semantic analysis.

- Tags: internals
- Published: 2026-03-04

### [How to Use forc-addr2line to Debug Compiled Sway Contracts](/FuelLabs/sway/how-to-use-forc-addr2line-for-debugging)

Learn how to use forc-addr2line to debug compiled Sway contracts. This tool maps bytecode addresses back to source code, simplifying your development process.

- Tags: how-to-guide
- Published: 2026-03-04

### [How the Sway LSP Provides IDE Support and Error Highlighting: A Deep Dive into the Language Server Protocol Implementation](/FuelLabs/sway/how-sway-lsp-provides-ide-support)

Discover how Sway LSP offers IDE support and error highlighting. It powers real-time compiler diagnostics for editors, displaying errors, warnings, and hints.

- Tags: deep-dive
- Published: 2026-03-04

### [How Do Predicates Differ from Contracts in Sway: A Complete Technical Guide](/FuelLabs/sway/how-predicates-differ-from-contracts-in-sway)

Learn the key differences between Sway predicates and contracts. Understand their stateless vs stateful nature, UTXO unlocking, ABI exposure, and data persistence.

- Tags: deep-dive
- Published: 2026-03-04

### [How Sway Storage Allocation and Storage Keys Work: Compile-Time Key Generation in Fuel VM Contracts](/FuelLabs/sway/how-sway-storage-allocation-and-keys-work)

Understand how Sway storage allocation and storage keys work. Learn about compile-time key generation in Fuel VM contracts for organized data management.

- Tags: internals
- Published: 2026-03-04

### [How to Use Intrinsic Functions in Sway Contracts: A Complete Guide](/FuelLabs/sway/how-to-use-intrinsic-functions-in-sway-contracts)

Master intrinsic functions in Sway contracts. Learn how these low-level Fuel VM operations enhance your smart contract development with direct access or safe standard library wrappers.

- Tags: how-to-guide
- Published: 2026-03-04

### [How Trait Coherence Checking Works in Sway's Type System: Orphan and Overlap Rules Explained](/FuelLabs/sway/how-trait-coherence-works-in-sway-type-system)

Understand trait coherence checking in Sway. Learn how orphan and overlap rules ensure unambiguous trait implementations across packages for deterministic code.

- Tags: deep-dive
- Published: 2026-03-04

### [How Sway Monomorphization Handles Generic Types at Compile Time](/FuelLabs/sway/how-sway-monomorphization-handles-generic-types)

Learn how Sway monomorphization handles generic types by substituting concrete types during type-checking, creating specialized copies before LLVM IR generation.

- Tags: internals
- Published: 2026-03-04