Go Fundamentals
Go Fundamentals teaches core Go syntax, types, functions, structs, interfaces, and concurrency primitives, enabling developers to write idiomatic, efficient code using the standard library without external frameworks.
Who Should Take This
Junior to mid‑level software engineers who have programmed in at least one language and want to add Go to their toolkit will benefit. The course suits developers seeking solid foundations in Go’s type system, structuring code with interfaces, and mastering goroutines and channels for concurrent applications.
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
20 Activity Formats
Course Outline
60 learning goals
1
Types & Variables
3 topics
Basic types and declarations
- Identify Go basic types (int, int8-int64, uint, float32, float64, bool, string, byte, rune) and describe their zero values and size characteristics.
- Implement variable declarations using var, short declaration (:=), and multiple assignment, and explain the difference between package-level and function-level scope.
- Implement typed and untyped constants with const and iota for enumerated constant groups.
Composite types
- Describe arrays (fixed-size), slices (dynamic), and the relationship between them including length, capacity, and the append function.
- Implement slice operations including make, append, copy, slicing with [low:high:max], and explain how slices share underlying arrays.
- Implement maps with make, literal syntax, insertion, deletion, lookup with comma-ok pattern, and iteration with range.
- Analyze slice capacity growth behavior and memory sharing to predict when append creates a new backing array versus modifying the existing one.
Pointers and type conversions
- Describe pointer types (*T), the address-of operator (&), dereferencing (*p), and explain why Go has no pointer arithmetic.
- Implement explicit type conversions between numeric types, string/byte slice conversions, and the strconv package for string-to-number parsing.
- Describe the new and make built-in functions and explain when each is appropriate for allocating pointers, slices, maps, and channels.
2
Functions & Methods
3 topics
Function declarations
- Describe function signatures with typed parameters, multiple return values, and named return values, and explain the blank identifier (_) for discarding values.
- Implement variadic functions with ...T syntax and explain how to pass slices to variadic parameters with the spread operator (slice...).
- Implement first-class functions by assigning functions to variables, passing them as arguments, and returning them from other functions.
Closures and defer
- Implement closures that capture and modify variables from their enclosing scope and explain the closure-over-loop-variable pitfall.
- Describe defer statement semantics including LIFO execution order, argument evaluation timing, and common patterns for resource cleanup.
- Implement defer for file closing, mutex unlocking, and connection cleanup, and explain how defer interacts with named return values.
- Explain panic and recover mechanics and describe when panicking is appropriate versus returning errors in idiomatic Go.
Methods
- Implement methods with value receivers and pointer receivers and explain how the receiver type determines whether the method can modify the struct.
- Analyze when to use value receivers versus pointer receivers based on mutation needs, struct size, and interface satisfaction requirements.
3
Structs & Interfaces
3 topics
Struct definitions and composition
- Describe struct type definitions with named fields, anonymous fields, and struct literal syntax including the keyed and unkeyed forms.
- Implement struct embedding (composition) to promote fields and methods from embedded types and explain how Go achieves code reuse without inheritance.
- Implement struct tags for JSON serialization with encoding/json including field naming, omitempty, and custom marshal/unmarshal behavior.
- Compare struct embedding versus explicit fields to determine when promoted methods create appropriate API surfaces versus when they leak implementation details.
Interface definitions and satisfaction
- Describe implicit interface satisfaction in Go and explain how any type with matching methods automatically implements the interface without explicit declaration.
- Implement custom interfaces and apply the accept interfaces, return structs principle to design flexible and testable function signatures.
- Describe common standard library interfaces (io.Reader, io.Writer, fmt.Stringer, sort.Interface, error) and explain how they enable polymorphic behavior.
- Implement the io.Reader and io.Writer interfaces on custom types to integrate with the standard library I/O pipeline.
Type assertions and the empty interface
- Describe the empty interface (any/interface{}) and explain its role as Go's universal type for holding values of unknown type.
- Implement type assertions (v.(T)) with the comma-ok pattern and type switches to safely extract concrete types from interface values.
- Evaluate the trade-offs between using the empty interface with type assertions versus generics (type parameters) for type-flexible functions.
4
Concurrency
4 topics
Goroutines
- Describe goroutines as lightweight concurrent functions, explain the go keyword, and describe how the Go scheduler multiplexes goroutines onto OS threads.
- Implement goroutines with sync.WaitGroup to launch concurrent work and wait for all goroutines to complete before proceeding.
- Analyze goroutine leak scenarios where goroutines block indefinitely on channels or I/O and determine strategies for preventing resource leaks.
Channels
- Describe unbuffered and buffered channels, the make function for channel creation, and the send (<-) and receive operations including their blocking behavior.
- Implement channel-based communication patterns including producer-consumer, fan-out/fan-in, and pipeline stages with proper channel closing.
- Implement directional channels (chan<- T for send-only, <-chan T for receive-only) in function signatures to enforce communication direction at compile time.
- Analyze deadlock scenarios caused by channel operations and determine whether the issue is an unbuffered channel without a receiver, a closed channel write, or a missing close.
Select and synchronization primitives
- Describe the select statement for multiplexing channel operations and explain default cases for non-blocking channel reads.
- Implement select with timeout using time.After and cancellation using context.Context to build responsive concurrent operations.
- Implement sync.Mutex and sync.RWMutex to protect shared state from concurrent access and explain the critical section pattern.
- Implement sync.Once for thread-safe one-time initialization and describe when to use it versus init functions or package-level variables.
- Compare channels versus mutexes for synchronization and evaluate which approach produces clearer and more maintainable concurrent code for given scenarios.
Context package
- Describe the context.Context interface and explain the purpose of context.Background, context.TODO, context.WithCancel, context.WithTimeout, and context.WithValue.
- Implement context-based cancellation propagation across goroutines to gracefully shut down concurrent operations when a parent context is canceled.
- Evaluate context usage patterns to determine appropriate timeout values, when to use WithValue versus explicit parameters, and how to propagate contexts through function call chains.
5
Packages & Modules
2 topics
Package organization
- Describe Go package conventions including the package declaration, import paths, exported (capitalized) versus unexported identifiers, and the main package.
- Implement multi-file packages with init functions and explain init execution order across files and imported packages.
- Analyze package dependency graphs to identify import cycles and apply Go's prohibition on circular imports to restructure code.
Go modules
- Describe go.mod and go.sum files, semantic versioning in Go modules, and the go mod init, go mod tidy, and go get commands.
- Implement a multi-package module with internal packages and explain how the internal directory convention restricts package visibility.
6
Error Handling & Testing
2 topics
Error handling patterns
- Describe the error interface, errors.New, and fmt.Errorf and explain Go's convention of returning errors as the last return value.
- Implement error wrapping with fmt.Errorf and the %w verb, and unwrap errors using errors.Is and errors.As for type-safe error inspection.
- Implement custom error types that satisfy the error interface and carry structured context such as status codes, field names, and nested errors.
- Implement sentinel errors as package-level var declarations and explain their role in providing stable error identities for callers to check with errors.Is.
- Evaluate error handling strategies to determine when to wrap, when to create new errors, when to use sentinel errors, and when to use custom error types.
Testing fundamentals
- Describe the testing package conventions including test file naming (_test.go), test function signatures (func TestXxx(t *testing.T)), and the go test command.
- Implement table-driven tests with test case slices and subtests (t.Run) to cover multiple input/output combinations in a single test function.
- Implement test helpers with t.Helper(), t.Cleanup(), and t.TempDir() and explain how they improve test readability and resource management.
- Implement benchmarks with func BenchmarkXxx(b *testing.B) and the b.N loop, and use go test -bench to measure and compare function performance.
- Analyze test coverage reports from go test -cover to identify untested code paths and prioritize which branches to add test cases for.
Hands-On Labs
15 labs
~385 min total
Console Simulator
Practice in a simulated cloud console or Python code sandbox — no account needed. Each lab runs entirely in your browser.
Scope
Included Topics
- Go 1.22+ language fundamentals: basic types (int, float64, string, bool, byte, rune), variables, constants, iota, type conversions, and short variable declarations.
- Functions: multiple return values, named return values, variadic functions, first-class functions, closures, and defer/panic/recover.
- Structs: field definitions, embedded structs (composition), methods with value and pointer receivers, and struct tags.
- Interfaces: implicit satisfaction, the empty interface (any), type assertions, type switches, and common standard library interfaces (io.Reader, io.Writer, fmt.Stringer, error).
- Concurrency: goroutines, channels (buffered and unbuffered), select statement, sync.WaitGroup, sync.Mutex, sync.Once, and the context package for cancellation.
- Packages and modules: go.mod, import paths, exported versus unexported identifiers, init functions, and the standard library (fmt, os, io, strings, strconv, sort, errors).
- Error handling: the error interface, errors.New, fmt.Errorf with %w, errors.Is, errors.As, and sentinel errors.
- Testing: the testing package, table-driven tests, test helpers, benchmarks, and the go test command.
Not Covered
- Web frameworks (Gin, Echo, Fiber, Chi) and HTTP server patterns beyond basic net/http.
- CGo and calling C code from Go.
- Advanced reflection (reflect package) beyond basic awareness.
- Generics type parameter syntax beyond basic usage (complex constraint sets, type inference edge cases).
- Database drivers and ORMs (database/sql patterns are excluded).
- Container orchestration, deployment, and Go-specific DevOps tooling.
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