From Zero to Go Hero: Mastering Automation with Go!

Create a basic hello world program in Go using VS Code, with Main.go, package main, and func main that prints Hello world with the fmt package.

Run the Hello World program with go run main.go and explore essential go commands, including go mod init, go run, go get, and managing dependencies with go.sum.

Explore how the import keyword brings packages like fmt into main.go, and use fmt functions to print to strings, files, or terminal, contrasting built-in math and net with third-party packages.

Explore the func keyword to define a function, its arguments and output, then see how a Go file is organized with package, imports, and a Hello World main function.

Learn to use the fmt package’s print tools: println for multi-value output with spaces and newline, printf for template formatting, and a string-returning variant for custom messages, with common verbs.

Learn to declare and assign variables in Go with var height int = 12 and height := 12, compare static and dynamic typing, and note fmt import in VSCode.

Explore advanced Go variable declaration, including multiple variables, type inference, and reassignment; learn to declare, initialize, and group related variables, plus zero values and package-level scope.

Explore constants in Go, learn how fixed values improve readability and maintainability, declare with types or type inference, and use iota to auto increment and reset across const blocks.

Init functions run before main to initialize state per source file. They execute in order across files and packages, as shown by go run, with exported capital names exposing functions.

Explore how to define functions in Go, including normal, multiple return values, named return variables, variadic parameters, and different input types, with examples like add, divide, and naked returns.

Explore the Go for loop syntax, including initialization, condition, and post statements, and learn variations with multiple variables, break and continue, nested loops, labels, and avoiding infinite loops.

Master the switch statement in Go by learning basic syntax, switch expressions, multiple values, initializing statements, a switch true variant, fall through, and labeled breaks to control flow.

Learn how to create and return errors in Go, print them, and check for nil errors using the errors and fmt packages, with a sample getValue function.

Learn how the defer keyword postpones function calls until the surrounding function returns, enabling reliable cleanup (like closing files), with last-in-first-out execution and immediate argument evaluation.

Discover how a deferred function reads and modifies a named return value of an outer function using a function literal. Learn when to reflect cleanup errors in the final return.

Understand how panic in Go creates a runtime error, aborts execution, and unwinds the call stack, how defer runs during unwinding, and when to panic rather than continue.

Explore how the recover function resumes normal execution after a panicking function, used inside defers to capture the panic value or nil, with write to file and close file examples.

Explore advanced composite data types in Go, including arrays, slices, maps, and structs. Understand fixed length vs dynamic growth and fast key-value lookups and field access.

Explore how arrays store multiple values in contiguous memory with Go's fixed-length, zero-indexed design, where length is part of the type and elements initialize by default.

Explore alternative array declarations in Go, using array literals and the ellipsis operator for auto length, plus keyed element initialization. See zero value defaults and zero-based indexing.

Master two array iteration methods in Go: a for loop using len and index, and a range loop with value and an optional variable, plus the blank identifier.

Explore copying an entire array in Go by looping from categories to codes, and by using the assignment operator on arrays of the same type and length, with before-and-after prints.

Discover that passing an array to a function copies it, so the original remains unchanged. Notice memory addresses differ; use a slice to update the original and avoid extra copying.

Explore how the Go append function adds elements to a slice, how length and capacity change, and how a new backing array is created with variadic ellipsis.

Learn how the make function creates slices with a preallocated backing array by specifying length and capacity to reduce allocations and control growth during appends.

Explore how loops interact with slices, including append pitfalls, range versus classic for loops, and the impact of slice expressions and nil slices on iteration.

Explore slice comparisons in Go: implement element-wise checks with a for loop, verify lengths, and use bytes.Equal, bytes.Compare, or reflect.DeepEqual to assess equality or lexicographic order.

Explore how slices behave when passed to and returned from functions, including how copies share backing arrays, and how append can create a new backing array affecting length and capacity.

Explore maps in Go, with unique, comparable keys and values of any type, and learn to read, write, update, and initialize maps including nil and make.

Deepen understanding of Go maps by showing how maps share an underlying hash table, how copies and function calls mutate keys, test existence, and delete entries.

Use for range loops to iterate maps, print name and score, and delete map contents, while understanding that maps are unordered and the loop size is fixed.

Explore how to compare maps in Go, including why the equality operator cannot compare maps and how to compare to nil. Use reflect deep equal and map-to-string techniques.

Explore struct embedding in Go, using shape and rectangle to show composition over inheritance, with anonymous fields, field access, and conflict resolution for embedded structs.

Explore how structs interact with functions in go; they are copied when passed and when returned, so changes inside a function don’t affect original unless reassigned from returned struct.

Explore how Go copies struct values on assignment, how to compare structs with the equality operator or deep equal, and how to handle non comparable fields like slices.