Head First Go Jay McGavren

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• Table of Contents (the real thing)
• how to use this book: Intro
  • Who is this book for?
    • Who should probably back away from this book?
  • We know what youre thinking
  • We know what your brain is thinking
  • Metacognition: thinking about thinking
  • Heres what WE did
  • Heres what YOU can do to bend your brain into submission
  • Read me
    • It helps if youve done a little programming in some other language.
    • We dont cover every type, function, and package ever created.
    • The activities are NOT optional.
    • The redundancy is intentional and important.
    • The code examples are as lean as possible.
  • Acknowledgments
  • OReilly Online Learning
• 1. lets get going: Syntax Basics
  • Ready, set, Go!
  • The Go Playground
  • What does it all mean?
    • The typical Go file layout
  • there are no Dumb Questions
  • What if something goes wrong?
  • Breaking Stuff is Educational!
  • Calling functions
  • The Println function
  • Using functions from other packages
  • Function return values
  • Pool Puzzle
  • A Go program template
  • Strings
  • Runes
  • Booleans
  • Numbers
  • Math operations and comparisons
  • Types
  • Declaring variables
  • Zero values
  • Code Magnets
  • Short variable declarations
  • Breaking Stuff is Educational!
  • Naming rules
  • Conversions
  • Installing Go on your computer
  • Compiling Go code
  • Go tools
  • Try out code quickly with go run
  • Your Go Toolbox
  • Pool Puzzle Solution
  • Code Magnets Solution
• 2. which code runs next?: Conditionals and Loops
  • Calling methods
  • Making the grade
  • Comments
  • Getting a grade from the user
  • Multiple return values from a function or method
  • Option 1: Ignore the error return value with the blank identifier
  • Option 2: Handle the error
  • Conditionals
  • there are no Dumb Questions
  • Logging a fatal error, conditionally
  • Code Magnets
  • Avoid shadowing names
  • Converting strings to numbers
  • Blocks
  • Blocks and variable scope
  • Weve finished the grading program!
  • Only one variable in a short variable declaration has to be new
  • Lets build a game
  • Package names vs. import paths
  • Generating a random number
  • Getting an integer from the keyboard
  • Comparing the guess to the target
  • Loops
  • Init and post statements are optional
  • Loops and scope
  • Breaking Stuff is Educational!
  • Using a loop in our guessing game
  • Skipping parts of a loop with continue and break
  • Breaking out of our guessing loop
  • Revealing the target
  • The finishing touches
  • Congratulations, your game is complete!
  • Your Go Toolbox
  • Code Magnets Solution
• 3. call me: Functions
  • Some repetitive code
  • Formatting output with Printf and Sprintf
  • Formatting verbs
  • Formatting value widths
  • Formatting fractional number widths
  • Using Printf in our paint calculator
  • Declaring functions
  • Declaring function parameters
  • Using functions in our paint calculator
  • Functions and variable scope
  • Function return values
  • Using a return value in our paint calculator
  • Breaking Stuff is Educational!
  • The paintNeeded function needs error handling
  • Error values
  • Declaring multiple return values
  • Using multiple return values with our paintNeeded function
  • Always handle errors!
  • Breaking Stuff is Educational!
  • Pool Puzzle
  • Function parameters receive copies of the arguments
  • Pointers
  • Pointer types
  • Getting or changing the value at a pointer
  • Code Magnets
  • Using pointers with functions
  • Fixing our double function using pointers
  • Your Go Toolbox
  • Pool Puzzle Solution
  • Code Magnets Solution
• 4. bundles of code: Packages
  • Different programs, same function
  • Sharing code between programs using packages
  • The Go workspace directory holds package code
  • there are no Dumb Questions
  • Creating a new package
  • Importing our package into a program
  • Packages use the same file layout
  • Breaking Stuff is Educational!
  • Pool Puzzle
  • Package naming conventions
  • Package qualifiers
  • Moving our shared code to a package
  • Constants
  • Nested package directories and import paths
  • Installing program executables with go install
  • Changing workspaces with the GOPATH environment variable
  • Setting GOPATH
    • On Mac or Linux systems:
    • On Windows systems:
  • Publishing packages
  • Downloading and installing packages with go get
  • Reading package documentation with go doc
  • Documenting your packages with doc comments
  • Viewing documentation in a web browser
  • Serving HTML documentation to yourself with godoc
  • The godoc server includes YOUR packages!
  • Your Go Toolbox
  • Pool Puzzle Solution
• 5. on the list: Arrays
  • Arrays hold collections of values
  • Zero values in arrays
  • Array literals
  • Functions in the fmt package know how to handle arrays
  • Accessing array elements within a loop
  • Checking array length with the len function
  • Looping over arrays safely with for...range
  • Using the blank identifier with for...range loops
  • Getting the sum of the numbers in an array
  • Getting the average of the numbers in an array
  • Pool Puzzle
  • Reading a text file
  • Reading a text file into an array
  • Updating our average program to read a text file
  • Our program can only process three values!
  • Your Go Toolbox
  • Pool Puzzle Solution
• 6. appending issue: Slices
  • Slices
  • Slice literals
  • Pool Puzzle
  • The slice operator
  • Underlying arrays
  • Change the underlying array, change the slice
  • Add onto a slice with the append function
  • Slices and zero values
  • Reading additional file lines using slices and append
  • Trying our improved program
  • Returning a nil slice in the event of an error
  • Command-line arguments
  • Getting command-line arguments from the os.Args slice
  • The slice operator can be used on other slices
  • Updating our program to use command-line arguments
  • Variadic functions
  • Using variadic functions
  • Code Magnets
  • Using a variadic function to calculate averages
  • Passing slices to variadic functions
  • Slices have saved the day!
  • Your Go Toolbox
  • Pool Puzzle Solution
  • Code Magnets Solution
• 7. labeling data: Maps
  • Counting votes
  • Reading names from a file
  • Counting names the hard way, with slices
  • Maps
  • Map literals
  • Zero values within maps
  • The zero value for a map variable is nil
  • How to tell zero values apart from assigned values
  • Removing key/value pairs with the delete function
  • Updating our vote counting program to use maps
  • Using for...range loops with maps
  • The for...range loop handles maps in random order!
  • Updating our vote counting program with a for...range loop
  • The vote counting program is complete!
  • Code Magnets
  • Your Go Toolbox
  • Code Magnets Solution
• 8. building storage: Structs
  • Slices and maps hold values of ONE type
  • Structs are built out of values of MANY types
  • Access struct fields using the dot operator
  • Storing subscriber data in a struct
  • Defined types and structs
  • Using a defined type for magazine subscribers
  • Using defined types with functions
  • Code Magnets
  • Modifying a struct using a function
  • Accessing struct fields through a pointer
  • there are no Dumb Questions
  • Pass large structs using pointers
  • Moving our struct type to a different package
  • A defined types name must be capitalized to be exported
  • Struct field names must be capitalized to be exported
  • Struct literals
  • Pool Puzzle
  • Creating an Employee struct type
  • Creating an Address struct type
  • Adding a struct as a field on another type
  • Setting up a struct within another struct
  • Anonymous struct fields
  • Embedding structs
  • Our defined types are complete!
  • Your Go Toolbox
  • Code Magnets Solution
  • Pool Puzzle Solution
• 9. youre my type: Defined Types
  • Type errors in real life
  • Defined types with underlying basic types
  • Defined types and operators
  • Pool Puzzle
  • Converting between types using functions
  • there are no Dumb Questions
  • Fixing our function name conflict using methods
  • Defining methods
  • The receiver parameter is (pretty much) just another parameter
  • there are no Dumb Questions
  • A method is (pretty much) just like a function
  • Pointer receiver parameters
  • Breaking Stuff is Educational!
  • Converting Liters and Milliliters to Gallons using methods
  • Converting Gallons to Liters and Milliliters using methods
  • Your Go Toolbox
  • Pool Puzzle Solution
• 10. keep it to yourself: Encapsulation and Embedding
  • Creating a Date struct type
  • People are setting the Date struct field to invalid values!
  • Setter methods
  • Setter methods need pointer receivers
  • Adding the remaining setter methods
  • Adding validation to the setter methods
  • The fields can still be set to invalid values!
  • Moving the Date type to another package
  • Making Date fields unexported
  • Accessing unexported fields through exported methods
  • Getter methods
  • Encapsulation
  • there are no Dumb Questions
  • Embedding the Date type in an Event type
  • Unexported fields dont get promoted
  • Exported methods get promoted just like fields
  • Encapsulating the Event Title field
  • Promoted methods live alongside the outer types methods
  • Our calendar package is complete!
  • Your Go Toolbox
• 11. what can you do?: Interfaces
  • Two different types that have the same methods
  • A method parameter that can only accept one type
  • Interfaces
  • Defining a type that satisfies an interface
  • Concrete types, interface types
  • Assign any type that satisfies the interface
  • You can only call methods defined as part of the interface
  • Breaking Stuff is Educational!
  • Fixing our playList function using an interface
  • there are no Dumb Questions
  • Type assertions
  • Type assertion failures
  • Avoiding panics when type assertions fail
  • Testing TapePlayers and TapeRecorders using type assertions
  • Pool Puzzle
  • The error interface
  • there are no Dumb Questions
  • The Stringer interface
  • The empty interface
  • Your Go Toolbox
  • Pool Puzzle Solution
• 12. back on your feet: Recovering from Failure
  • Reading numbers from a file, revisited
  • Any errors will prevent the file from being closed!
  • Deferring function calls
  • Recovering from errors using deferred function calls
  • Ensuring files get closed using deferred function calls
  • Code Magnets
  • there are no Dumb Questions
  • Listing the files in a directory
  • Listing the files in subdirectories (will be trickier)
  • Recursive function calls
  • Recursively listing directory contents
  • Error handling in a recursive function
  • Starting a panic
  • Stack traces
  • Deferred calls completed before crash
  • Using panic with scanDirectory
  • When to panic
  • The recover function
  • The panic value is returned from recover
  • Recovering from panics in scanDirectory
  • Reinstating a panic
  • there are no Dumb Questions
  • Your Go Toolbox
  • Code Magnets Solution
• 13. sharing work: Goroutines and Channels
  • Retrieving web pages
  • Multitasking
  • Concurrency using goroutines
  • Using goroutines
  • Using goroutines with our responseSize function
  • We dont directly control when goroutines run
  • Code Magnets
  • Go statements cant be used with return values
  • Sending and receiving values with channels
  • Synchronizing goroutines with channels
  • Observing goroutine synchronization
  • Breaking Stuff is Educational!
  • Fixing our web page size program with channels
  • Updating our channel to carry a struct
  • Your Go Toolbox
  • Code Magnets Solution
• 14. code quality assurance: Automated Testing
  • Automated tests find your bugs before someone else does
  • A function we should have had automated tests for
  • Weve introduced a bug!
  • Writing tests
  • Running tests with the go test command
  • Testing our actual return values
  • More detailed test failure messages with the Errorf method
  • Test helper functions
  • Getting the tests to pass
  • Test-driven development
  • Another bug to fix
  • there are no Dumb Questions
  • Code Magnets
  • Running specific sets of tests
  • Table-driven tests
  • Fixing panicking code using a test
  • Your Go Toolbox
  • Code Magnets Solution
• 15. responding to requests: Web Apps
  • Writing web apps in Go
  • Browsers, requests, servers, and responses
  • A simple web app
  • Your computer is talking to itself
  • there are no Dumb Questions
  • Our simple web app, explained
  • Resource paths
  • Responding differently for different resource paths
  • First-class functions
  • Passing functions to other functions
  • Functions as types
  • Pool Puzzle
  • Whats next
  • Your Go Toolbox
  • Pool Puzzle Solution
• 16. a pattern to follow: HTML Templates
  • A guestbook app
  • Functions to handle a request and check errors
  • Setting up a project directory and trying the app
  • Making a signature list in HTML
  • Making our app respond with HTML
  • The text/template package
  • Using the io.Writer interface with a templates Execute method
  • ResponseWriters and os.Stdout both satisfy io.Writer
  • Inserting data into templates using actions
  • Making parts of a template optional with if actions
  • Repeating parts of a template with range actions
  • Inserting struct fields into a template with actions
  • Reading a slice of signatures in from a file
  • there are no Dumb Questions
  • A struct to hold the signatures and signature count
  • Updating our template to include our signatures
  • there are no Dumb Questions
  • Letting users add data with HTML forms
  • Responding with the HTML form
  • Form submission requests
  • Path and HTTP method for form submissions
  • Getting values of form fields from the request
  • Saving the form data
  • HTTP redirects
  • Lets try it all out!
  • Our complete app code
  • Your Go Toolbox
• 17. Congratulations!: You made it to the end.
• 18. This isnt goodbye
• A. understanding os.openfile: Opening Files
  • Understanding os.OpenFile
  • Passing flag constants to os.OpenFile
  • Binary notation
  • Bitwise operators
  • The bitwise AND operator
  • The bitwise OR operator
  • Using bitwise OR on the os package constants
  • Using bitwise OR to fix our os.OpenFile options
  • Unix-style file permissions
  • Representing permissions with the os.FileMode type
  • Octal notation
  • Converting octal values to FileMode values
  • Calls to os.OpenFile, explained
  • there are no Dumb Questions
• B. six things we didnt cover: Leftovers
  • #1 Initialization statements for if
  • #2 The switch statement
  • there are no Dumb Questions
  • #3 More basic types
  • #4 More about runes
  • #5 Buffered channels
  • #6 Further reading
• Index

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