Resources

Unparsed

https://www.educative.io/blog/golang-tutorial#advanced https://go.dev/doc/effective_go https://changelog.com/gotime https://go.dev/blog/all https://www.carlomaiorano.me/golang/2019/10/03/generating-code-golang.html https://go-proverbs.github.io/ https://golangbyexample.com/golang-comprehensive-tutorial/ https://www.golangprograms.com/advance-programs.html https://gobyexample.com/ https://go.dev/doc/tutorial/ https://go.dev/doc/ https://roadmap.sh/golang https://github.com/Alikhll/golang-developer-roadmap https://www.gopherguides.com/courses/web-api-golang-training https://www.gopherguides.com/courses/profiling-optimizing-golang-training https://www.gopherguides.com/courses/advanced-golang-training https://www.gopherguides.com/courses/mastering-golang-training

Groups

From Group

Go Blog

Language

• JSON-RPC: a tale of interfaces
• Go's Declaration Syntax
• Defer, Panic, and Recover
• Go Concurrency Patterns: Timing out, moving on
• Go Slices: usage and internals
• A GIF decoder: an exercise in Go interfaces
• Error Handling and Go
• Organizing Go code

Packages

• JSON and Go - using the json package.
• Gobs of data - the design and use of the gob package.
• The Laws of Reflection - the fundamentals of the reflect package.
• The Go image package - the fundamentals of the image package.
• The Go image/draw package - the fundamentals of the image/draw package.

Modules

• Using Go Modules - an introduction to using modules in a simple project.
• Migrating to Go Modules - converting an existing project to use modules.
• Publishing Go Modules - how to make new versions of modules available to others.
• Go Modules: v2 and Beyond - creating and publishing major versions 2 and higher.
• Keeping Your Modules Compatible - how to keep your modules compatible with prior minor/patch versions.

Tools

• About the Go command - why we wrote it, what it is, what it's not, and how to use it.
• Debugging Go Code with GDB
• Data Race Detector - a manual for the data race detector.
• A Quick Guide to Go's Assembler - an introduction to the assembler used by Go.
• C? Go? Cgo! - linking against C code with cgo.
• Godoc: documenting Go code - writing good documentation for godoc.
• Profiling Go Programs
• Introducing the Go Race Detector - an introduction to the race detector.

Variables

• Variables in Go -- Complete Guide
• Understanding var keyword in golang
• Scope of a variable in golang
• Naming conventions for variables and constant in golang
• Understanding := symbol or short variable declaration in golang
• Hello World in golang

Constant

• Constant in Golang
• Can constant be reassigned after its declaration in Go
• Constant in inner/outer scope in Golang
• Global and Local Constant in Golang
• Typed and Untyped constant in Golang
• Declaring a constant in Golang
• String constant in Golang
• Numeric/Integer/Float constant in Golang
• Boolean constant in Golang
• Character constant in Golang
• Multiple constant declarations in Golang
• Constant Map in Golang
• Constant struct in Go (Golang)
• Constant array or slice in Golang

Conditions and Loops

• Understand if else in golang
• for loop in golang
• Switch Statement in Go
• fallthrough keyword in go
• for-range loop in Go
• Goto statement in Golang

Packages/Modules

• Packages and Modules in Go (Golang) -- Part 1
• Packages and Modules in Go (Golang) -- Part 2
• Modules in Golang
• Direct vs Indirect Dependencies in go.mod file in Go
• Manual download dependency from go.mod file in Golang
• Selection of the version of library or dependency in Golang
• Importing package from different module locally in Golang
• Importing package within the same module in Golang
• What does go mod tidy do in Golang
• Add a dependency to your project or module in Golang
• Executable and non-executable module in Golang
• //indirect for a dependency in go.mod file in Golang
• Understanding Module name or module import path in Golang
• Vendor dependencies of a module in Golang
• Understanding go.sum and go.mod file in Golang
• Package vs Module in Golang
• Remove a dependency from a module in Golang
• Init function in Golang
• Order of execution of a Go program
• Nested Packages in Golang
• Package Name and Directory/Folder Name in Golang- Does they need to be the same
• Blank Identifier in import in Golang
• Import same package name or Aliasing while importing packages in Golang

Array/Slice

• Understanding Array in golang
• Understanding slice in golang
• Multi-Dimensinal Array and Slice in golang
• Copy an array or slice in golang
• Different ways of iterating over array and slice.
• Check if an item exists in a slice
• Find and delete an item in a slice
• Find and delete an item in an array
• Print an array or slice elements in golang
• Declare/Initialize/Create an array or slice in golang
• Convert an array/slice into a JSON string in golang
• Append or Add to a Slice or Array in Golang
• Slice of Struct in Golang
• Slice of Map in Golang
• Slice or Array of Channels in Golang
• Slice or Array of Bool in Golang
• Create Slice or Array of Integers in Golang
• Create Slice or Array of Floats in Golang
• Create Slice or Array of Strings in Golang
• Sort a part of the slice in Golang
• Append one slice to another slice in Golang

Maps

• Different ways of iterating over map
• Length of a map in golang
• Maps in Golang -- Complete Guide
• Check if a key exists in a map in golang
• Update a key in map in golang
• Allowed key and value types for a map in golang
• Create/Initialize/Declare map in golang
• Conversion between map and JSON in Golang
• Convert a map to JSON in Golang
• Convert a JSON to map in Golang
• How to check if a map contains a key in Golang

Struct

• Struct in golang -- Complete Guide
• Creating and Intializaing struct variables in golang
• Pointer to a struct
• Pretty Print Struct Variables in golang
• Exported and non-exported fields of a struct
• Anonymous Fields in a Struct in golang
• Struct Equality in golang
• Accessing and Setting Struct fields in golang
• Nested Struct in golang
• Struct Field Meta or Tags in golang
• Conversion between struct and JSON in Golang
• How to intialize a struct that has another nested struct in Golang
• How to initialize a struct having an array or slice field in Golang
• How to access the struct from another package in Golang

Method

• Method in golang -- Complete Guide
• Pointer Receiver for a method in Golang
• Method on a non-struct type in golang
• Method chaining in golang

Interface

• Interface in go
• Pass an Interface as an argument to a function
• Interface to struct
• Embedding interface in go
• Interface Comparison in golang
• Benefits of Interface in golang
• Pointer vs Value Receiver for interface in Go
• Declaring and Implementing an interface in golang
• Interface are implemented implicity in golang
• Type implementing multiple interfaces in go
• Print underlying type and value of an interface in golang
• Inner working or internal of an interface in Golang
• Non-Struct type implementing multiple interfaces in Golang
• Zero value of an Interface in golang
• Accessing underlying variable of an interface in Golang

Builtin Package

• Copy function in golang
• Append function in golang

Context

• Using context in go -- Complete Guide

GO Installation/Set-Up

• Installing GO on MAC
• Installing GO on Linux
• Installing GO on Windows

Channel

• Channel in Go
• Inner working of Channels
• Channel as a function argument in Go
• Send and receive on a nil channel in Go
• Close operation on a channel in Go
• Channel Direction in Go
• Length and capacity of a channel in Go
• All operations/function on a channel in Go
• Read/receive all values from a channel in Go
• For-range loop for a channel in Go

Goroutines

• Goroutines in Go
• Number of currently running/active goroutines
• Wait for all goroutines to finish execution
• Receive or Fetch Return Value from a goroutine in golang
• Receive or fetch multiple return values from a goroutine in golang
• Pause Execution of a goroutine until an activity or event is completed in Golang

Select

• Select Statement in Go
• Select statement with a for loop outside in Go
• Select with default case in Go
• Select with send operation in Golang
• Select statement with a nil channel in Golang
• Select versus switch in Golang
• Fallthrough keyword in select statement in Golang
• Break statement in Select in Golang
• Execute multiple case in Select statement in Golang
• Empty select or select with no case in Golang
• Select statement with timeout in Golang

Data Types

• All data types in Go with examples
• All basic data types in Golang
• Know Size and Range of int and uint
• Default Value of all types with examples
• Character in Golang
• uintptr in Golang
• Rune in Golang

Pointer

• Pointer in Golang
• Pointer to a Pointer in Golang
• * or dereferencing pointer in Golang
• Pointer Arithmetic in Golang
• Default zero value of pointer in Golang

IOTA

• IOTA in Golang

String

• Check if string is a number
• Remove all white spaces from a string
• Write a multiline string in Go
• String compare in GO
• Check if a string contains another string in GO
• Split a string by delimiter in Go
• Get all the words from a sentence
• Join a string by delimiter or a separator in Go
• Check if string begins with a prefix in Go
• Check if string ends with a suffix in Go
• Convert string to lowercase in Go
• Convert string to uppercase in Go
• Capitalize a string in Go
• Trim prefix of a string in Go
• Trim suffix of a string in Go
• Trim leading and trailing whitespaces from a string
• Count instances of substring in a string in Go
• Find index of first instance of a substring in Go
• Replace all instances of a substring with another in Go
• Replace some instances of a substring with another in Go
• Replace a character with another in a string in Go
• Find the index of the last instance of a substring in Go
• Index character in a string in Go
• Generate all permutation of a string in Go
• Swap characters of a string in Go
• Swap two strings in Go
• Reverse a string in Go
• Find and detete a character in Go
• Find and delete a substring in Go
• Delete in a string by index in Go
• Create count/repeating copies of a string in GO
• Case insensitive comparison of two strings in Go
• Number of Characters in a string in Go
• Get ASCII code of any Alphabet or Number in Go
• Iterate over a string in golang
• Length of a string in golang
• ASCII digit to the character in Golang
• Write to write or print backslash in a string in Golang
• Print string with double quotes in Golang
• Sort a string in Golang

Math

• Ceil of a number in Go
• Floor of a number in Go
• Get Integer value of a float in Go
• Round a number in Go
• Round Even a number in Go
• Remove Decimarl parts of a float in Go
• Get Absolute value of a number
• Pi value in Go
• Square root of a number in Go
• Cube Root of a number in Go
• Log of a number in Go
• Remainder or Modulus in Go
• Break a number into integer and fraction parts in Go
• Power function in Go
• Check if a number is positive or negative in Go
• Min of two numbers in Go
• Max of two numbers in Go

Random

• Generate random number in Go
• Generate random password
• Pick a random element in an array/slice in Go
• Pick a random character in string in Go
• Shuffle a string in Go
• Shuffle a slice or array in Go
• Generate a random array/slice of n integers in Go
• Generate a number in a given range
• Generate a random string in Go

Float

• Parse string representation of a float

Bool

• Parse string representation of a bool
• Format specifier for boolean in golang

Sync

• Understanding WaitGroup in Go

Loop

• Implement while loop in Go

Function

• Immediately Invoked Function in Go
• Function Closures in Go
• Pass Function as an argument to another function
• Return a function from another function
• Pass Variable Number of Arguments to a function
• Difference between function and method
• Anonymous Function in Go
• Higher Order Function in Go
• User Defined Function Type
• Return Multiple Values from a function
• Function in Golang -- Complete Guide
• How to call a function from another package in Golang

Defer

• Defer keyword in Golang
• Defer a goroutine in Golang
• Use Case of defer function in Golang
• Inline Function in Defer in Golang
• Evaluation of defer arguments in Golang
• Custom Function in defer in Golang
• How does defer works in Golang
• Defer function and Named Return Values in Golang
• Multiple defer functions in Golang
• Defer and Methods in Golang
• Can defer be used inside main function in Golang

Panic & Recover

• Panic and Recover in Golang
• Recover a panic in a different function in Go
• Panic with Defer in Golang
• Runtime Error Panic in Golang
• Panic format string in Golang
• Recover panic from goroutine in Golang
• Return value of the function when panic is recovered in Golang
• Recover function return value in Golang
• Panic stack trace in Golang
• How to create panic in Golang
• Example of Recover Function in Golang
• What happens during panic in Golang
• Create panic by calling panic function in Golang
• Base64 encoding/Decoding in Golang

Generic Articles

• NewRelic in Go with deep instrumentation

• Redis Client Example

• Redis Cluster Client Example

• Maps: Not safe for concurrent use

• Octal and Hex in Go

• Double, Single and Back Quotes in Go

• All types of Client timeouts in (HTTP/TCP/UDP/ Unix Sockets Communication ) etc

• Generate a UUID/GUID in Go (Golang)

• Server Error -- 500 vs 502 vs 503 vs 504

• Print/Output text in color in console

• Print/Output text in bold in Golang

• Print/Output text in italic in Golang

• Print/Output text with a background in Golang

• Print/Output crossed-out text in Golang

• Print/Output text in underline in Golang

• Format a message without printing in Golang

• All about Base64 encoding/decoding -- Complete Guide

• HTTP- Understanding multipart/form-data content-type

Object-Oriented Programming in GO

• Inheritance
  • OOP: Inheritance in GOLANG complete guide
  • Using Struct
  • Using Interface
  • Using Interface + Struct
• Polymorphism
  • OOP: Polymorphism in Go Complete Guide
  • Compile Time Polymorphism in Go (Golang)
  • Runtime Polymorphism in Go (Golang)
  • Method Overloading in Go (Alternatives/Workarounds)
• Abstract Classes
  • Abstract Class in Go: Complete Guide
• Encapsulation
  • Encapsulation in Go

Protocol Buffers

• Protocol Buffer And Go: Getting Started

fmt package

• Println vs Print vs Printf in Golang
• Understanding Errorf function in Golang
• Understanding Fprintf function in Golang
• Understanding Fprint function in Golang
• Understanding Fprintln function in Golang
• Understanding Println function in Golang
• Understanding Printf function in Golang
• Understanding Print function in Golang

GRPC

• Difference between GRPC and Rest

Design Patterns

• All Design Pattern in GO -- Curated List
• Creational
  • Abstract Factory Pattern
  • Builder Pattern
  • Factory Pattern
  • Object Pool Pattern
  • Prototype Pattern
  • Singleton Pattern
• Behavioral
  • Chain of Responsibility Design Pattern
  • Command Design Pattern
  • Iterator Design Pattern
  • Mediator Design Pattern
  • Memento Design Pattern
  • Null Object Design Pattern
  • Observer Design Pattern
  • State Design Pattern
  • Strategy Design Pattern
  • Template Method Design Pattern
  • Visitor Design Pattern
• Structural
  • Adapter Design Pattern
  • Bridge Design Pattern
  • Composite Design Pattern
  • Decorator design pattern
  • Facade Design Pattern
  • Flyweight Design Pattern
  • Proxy Design Pattern

Files

• Read
  • Read a large file Word by Word in Go
  • Read a large file Line by Line in Go
  • Read a file into a variable in Golang
• Write
  • Write to a file in Go
  • Append to a file
• Delete
  • Delete a file in Go
  • Delete a folder in Go
• Update
  • Change the updated/modified time of a file in Go
• Rename
  • Rename a file or folder
• Generic
  • Check if a file is a directory in Go
  • Create an empty file in Go
  • Check if a file or directory exists in Go
  • Iterate over a directory tree
  • Get Current Working Directory in Go
  • Touch a file in Go
  • Move file from one location to another
  • Get File Name, Size, Permission Bits, Mode, Modified Time in Go
  • Copy a file in Go

Folder/Directory

• Create a directory
• Change Current Working Directory in Go

Validation

• Validate the presence of the field in a struct in Golang
• Validate the range of the integer in a struct in Golang

Time

• All about time and date in Go
• Represent date of birth in golang.
• Get age given a dob
• Current Timestamp in Go
• Date/Time fomatting in Go
• Time Conversion in Go
• Parse Time in Go
• Time Difference between two dates
• Get current time and date of different timezones
• Convert time between different timezones
• Understanding Duration in Go
• Add/Subtract to time
• Convert Unix Timestamp to time.Time
• Date in Golang
• Create new time instance

Type Conversion

• Convert float to int in Golang
• Convert int to float in Golang
• Conversion between float32 and float64 in Golang

Image

• Download a file or image from a URL

OS

• Execute shell file from Go
• List All env variables in Go
• Set or Get or Unset env variables in Go
• Check if an env variable is set or not
• Detect OS at runtime in Go
• Get Hostname in Go
• Return Exit Status Code in Go
• Execute an OS/System Command in Go
• Get Current Username in Go
• Get Current User's Home Directory in Go
• Load a .env or environment file in Golang

net/HTTP

• net/http package get Query Params in Go
• net/http Package -- Detecting Timeout
• Basic HTTP server in go
• Get headers from an incoming HTTP request in Golang
• Set response headers for an incoming HTTP request in Golang
• Get response headers for an outgoing HTTP request in Go (Golang)
• Set headers for an outgoing HTTP request in Golang
• Check if a particular header is present in an HTTP request in Golang
• Canonical HTTP Header Key Meaning
• Get JSON request body from a HTTP request in Golang
• Get client's user agent from an incoming HTTP request in Golang
• HTTP Client/Server with Basic Auth in Golang
• Parse application/x-www-form-urlencoded http request body in Golang
• HTTP client or Send x-www-form-urlencoded request body in Golang
• HTTP send/receive jpeg file request body example in Golang
• HTTP send/receive pdf file in request body example in Golang
• HTTP send/receive png file in request body example in Golang
• HTTP client/server multipart form-data request body example in Golang
• HTTP send/receive application octet-stream request body in Golang
• Why the response body is closed in golang
• Set a timeout while making an HTTP request in Golang
• Validate the range of the integer in an HTTP request body struct in Golang
• HTTP Client to not follow redirect in Golang
• Understanding Set-Cookie Response Header
• Cookie Jar in Golang
• Cookies in Golang
• Read cookie http in Golang
• Set cookie http in Golang
• Return 400 (Bad Request) in http response in Golang
• Return 404 (Resource Not Found) in http response in Golang
• Return 401 (UnAuthorized) in HTTP response in Golang
• Return 403 (Forbidden) in HTTP response in Golang
• Return 200 (StatusOK) in HTTP response in Golang
• Return 201 (StatusCreated) in HTTP response in Golang
• Return 500 or Internal Server Error in HTTP response in Golang
• How to set HTTP status code in response in Golang
• Return JSON body in HTTP response in Golang
• Return 202 (StatusAccepted) in HTTP response in Golang
• Return plain text body in HTTP response in Golang
• Return an image or file in HTTP response in Golang
• Parse a URL and extract all the parts in Golang
• Extract a URL from a string in Golang
• Convert Query Param String to Query Param Hash in Golang
• Get full hostname along with port from a URL in Golang
• Get or Extract Query Params from a URL in Golang

error

• Error in Golang
• Error in Golang- Advanced
• Different ways of creating an error in Golang
• Comparing error or error equality in Go
• Get underlying type from error or error assertion in Go
• Wrapping and Un-wrapping of error in Go
• Ignoring errors in Go

Data Structures

• All Data Structures in Golang
• Queue in Golang
• Stack in Golang
• Set in Golang
• Singly Linked List in Golang
• Doubly Linked List in Golang
• Binary Search Tree
  • Recursive
  • Iterative
• Heap in Golang
  • Minheap
  • Maxheap
• Trie

Integers

• Reverse a number or an integer in Go (Golang)
• Implement your own Atoi function in Go (Golang)
• Check if a number is a palindrome or not in Go (Golang)
• Find the next permutation of a number in Go (Golang)
• Program to add all digits of a number in Go (Golang)
• Divide two integers without using multiplication or division operator in Go (Golang)
• Program to calculate the power of a number in Go (Golang)
• Plus one program or Add one to an integer array in Go (Golang)

String

• Longest substring without repeating characters program in Golang
• Longest Palindromic Substring within a string in Go (Golang)
• Generate valid parentheses in Go (Golang)
• Check valid parenthesis in Go (Golang)
• Longest valid parentheses substring within a string in Go (Golang)
• Wildcard matching or regex matching program in Go (Golang)
• Add two binary numbers program in Go (Golang)
• Check if two given strings are anagrams in Go (Golang)
• Sub string program in Go (Golang)
• Letter Combinations of a Phone Number Program in Go (Golang)

Array

• Find two numbers in an array that adds up to a target number in Go (Golang)
• Medium of two sorted arrays in Go (Golang)
• Find all triplets in an array that adds to a zero in Go (Golang)
• Find all triplets in an array that adds to a target number in Go (Golang)
• Find the sum which is closest to a target number using three numbers in an array or 3Sum closest problem in Go (Golang)
• Find first missing positive integer in an int array in Go (Golang)
• Find the pivot index in a sorted and pivoted array in Go (Golang)
• Search in a sorted and pivoted array in Go (Golang)
• Find the first and last position of a target element in a sorted array in Go (Golang)
• Trapping rainwater problem in Go (Golang)
• Group anagrams together program in Go (Golang)
• Merge overlapping intervals in Go (Golang)
• Sort an array of 0, 1, and 2 in Go (Golang)
• Jump Game Program in Go (Golang)
• Remove duplicates from a sorted array in Go (Golang)
• Maximum sum subarray program in Go (Golang)
• Largest Rectangular Area in a Histogram in Go (Golang)
• Combination Sum Program in Go (Golang)
• Reverse Words in a sentence in Go (Golang)
• Program for Power set of a given array of integers in Go (Golang)
• Merge two sorted arrays in Go (Golang)
• Remove all occurrences of a given value in an array in place in Go (Golang)
• Unique Paths Program in Go (Golang)
• Best time to Buy-Sell Stocks Program in Go (Golang)

Matrix

• Spiral Matrix Problem in Go (Golang)
• Rotate a symmetric matrix or an image in place in a clockwise direction in Go (Golang)

Algorithm

• LRU Cache Implementation in Go (Golang)

Linked List

• Convert singly linked list into an array using Golang
• Convert singly linked list into a circular linked list using Golang
• Check if a linked list is circular in Golang
• Delete a kth node from the front in a Singly Linked List in Golang
• Delete a kth node from back in a Singly Linked List in Go (Golang)
• Reverse Doubly Linked List in Go
• Add two numbers represented by linked list in Golang
• Reverse a linked list in Go (Golang)
• Reverse nodes in k-group for a given linked list in Go (Golang)
• Pair swap nodes in a linked list in Go (Golang)
• Convert a sorted linked list to balanced BST in Go (Golang)
• Check if a given linked list has a cycle in Go (Golang)
• Rotate a linked list in Go (Golang)
• Detect cycle start node in a linked list in Go (Golang)
• Delete middle node of a linked list in Go (Golang)
• Partition a linked list in Go (Golang)

Dynamic Programming

• Edit Distance between two strings in Go (Golang)
• Interleaving String Program in Go (Golang)
• Longest Increasing Subsequence Program in Go (Golang)
• Range Sum Array Program in Go (Golang)
• Range Sum 2d array program in Go (Golang)
• Count Possible Decodings of a digit sequence into letters in Go (Golang)

Game

• Tic Tac Toe Complete Working Program in Go (Golang)

Tree

• Level Order Traversal of a binary tree in Go (Golang)
• Height or maximum depth of a binary tree in Go (Golang)
• Construct a binary tree from preorder and inorder in Go (Golang)
• Construct a binary tree from postorder and inorder in Go (Golang)
• Inorder traversal of a Binary Tree in Go (Golang)
• Postorder traversal of a Binary Tree in Go (Golang)
• Preorder traversal of a Binary Tree in Go (Golang)

Binary Search Tree

• Check if a given tree is a Binary Search Tree in Go (Golang)
• Sorted Array to Height Balanced BST in Go (Golang)

Generic Programs

• Infix to Postfix Conversion in Go (Golang)
• Evaluation of Postfix Expression in Go (Golang)

Sorting Algorithms

• Heap Sort
• Insertion Sort
• Selection Sort
• Bubble Sort

Network

• Validate an IP address in Go
• Check if an IP address is IPv4 or IPv6
• Get IP address from an incoming HTTP request

Regex or Regular Expression

• Golang Regex -- Include dot -- '.' inside square brackets or character class
• Concatenation or AND of regexes in Golang
• Alternation (OR) of regexes in Golang
• Golang regex: Match full string
• Golang regex: Understanding caret and dollar character
• Golang Regex: Match prefix or suffix of a string
• Golang Regex: Case insensitive regular expression matching in Golang
• Golang Regex: Matching raw or literal string
• Golang Regex: Understanding dot '.' character
• Golang Regex: Replace all string which matches a Regular Expression
• Golang Regex: Backreferences
• Golang Regex: Optional Operator or question mark (?) in regular expression
• Golang Regex: Match number or numeric digits in Regular Expression
• Golang Regex: Match a floating-point number in Regular Expression
• Golang Regex: Understanding Curly Braces in Regular Expressions
• Golang regex match any character
• Golang Regex: Use a variable inside a Regular Expression

Logger

• Go Logger Rotate

MAC OS

• Understanding /etc/paths and /etc/paths.d on MAC

JSON

• Json parse a file in Golang

Why Go?

• Why Go? -- Key advantages you may have overlooked
• Go vs. Java: 15 main differences

Step-by-step guides

- Go step by step

• Type, value and equality of interfaces
• Create, initialize and compare structs
• Slices/arrays explained: create, index, slice, iterate
• Maps explained: create, add, get, delete
• 5 basic for loop patterns
• 5 switch statement patterns
• Packages explained: declare, import, download, document

Go gotchas

• Assignment to entry in nil map
• Invalid memory address or nil pointer dereference
• Multiple-value in single-value context
• Array won't change
• See all 27 gotchas

Tutorials

- Go tutorials

• Go beginner's guide: top 4 resources to get you started
• How to use JSON with Go [best practices]
• Regexp tutorial and cheat sheet
• Java to Go in-depth tutorial

Cheat sheets

• Go string handling overview [cheat sheet]
• Conversions [complete list]
• fmt.Printf formatting tutorial and cheat sheet
• Format a time or date [complete guide]
• Regexp tutorial and cheat sheet
• Bitwise operators [cheat sheet]
• Start a new Go project [standard layout]
• Learn to love your compiler

Code for common tasks

- Go blueprints: code for common tasks

• 2 basic FIFO queue implementations
• 2 basic set implementations
• A basic stack (LIFO) data structure
• Access environment variables
• Access private fields with reflection
• Bitmasks, bitsets and flags
• Check if a number is prime
• Command-line arguments and flags
• Go as a scripting language: lightweight, safe and fast
• Compute absolute value of an int/float
• Compute max of two ints/floats
• 3 simple ways to create an error
• Create a new image
• Format byte size as kilobytes, megabytes, gigabytes, ...
• Generate all permutations
• Hash checksums: MD5, SHA-1, SHA-256
• Hello world HTTP server example
• How to best implement an iterator
• 4 iota enum examples
• Maximum value of an int
• Round float to 2 decimal places
• Round float to integer value
• The 3 ways to sort in Go
• Table-driven unit tests

Concurrent programming

- Concurrent programming

• Goroutines are lightweight threads
• Channels offer synchronized communication
• Select waits on a group of channels
• Data races explained
• How to detect data races
• How to debug deadlocks
• Waiting for goroutines
• Broadcast a signal on a channel
• How to kill a goroutine
• Timer and Ticker: events in the future
• Mutual exclusion lock (mutex)
• 3 rules for efficient parallel computation

Object-oriented programming

• Object-oriented programming without inheritance
• Constructors deconstructed [best practice]
• Methods explained
• Public vs. private
• Pointer vs. value receiver

Functional programming

• Functional programming in Go [case study]
• Function types and values
• Anonymous functions and closures
• How to best implement an iterator

Scripting

• Go as a scripting language: lightweight, safe and fast
• Read a file (stdin) line by line
• Command-line arguments and flags
• Access environment variables

StringsCheat sheet

• Go string handling overview [cheat sheet]
• fmt.Printf formatting tutorial and cheat sheet
• Regexp tutorial and cheat sheet
• Runes and character encoding
• Efficient string concatenation [full guide]
• Escapes and multiline strings
• 3 ways to split a string into a slice
• Convert between byte array/slice and string
• Convert between rune array/slice and string
• Convert between float and string
• Convert between int, int64 and string
• Convert interface to string
• Remove all duplicate whitespace
• 3 ways to trim whitespace (or other characters) from a string
• How to reverse a string by byte or rune

MapsStep-by-step

• Maps explained: create, add, get, delete
• 3 ways to find a key in a map
• Get slices of keys and values from a map
• Sort a map by key or value

Slices and arraysStep-by-step

• Slices/arrays explained: create, index, slice, iterate
• 3 ways to compare slices (arrays)
• How to best clear a slice: empty vs. nil
• 2 ways to delete an element from a slice
• Find element in slice/array with linear or binary search
• Last item in a slice/array

Files

• Read a file (stdin) line by line
• Append text to a file
• Find current working directory
• List all files (recursively) in a directory
• Create a temporary file or directory

Time and date

• Format a time or date [complete guide]
• Time zones
• How to get current timestamp
• Get year, month, day from time
• How to find the day of week
• Days between two dates
• Days in a month
• Measure execution time

Random numbers

• Generate random numbers, characters and slice elements
• Generate a random string (password)
• Generate a unique string (UUID, GUID)
• Shuffle a slice or array
• User-friendly access to crypto/rand

Language basics

• Go beginner's guide: top 4 resources to get you started
• Packages explained: declare, import, download, document
• Package documentation
• Package initialization and program execution order

Statements

• 4 basic if-else statement patterns
• 5 switch statement patterns
• 5 basic for loop patterns
• 2 patterns for a do-while loop in Go
• 4 basic range loop (for-each) patterns
• Defer a function call (with return value)
• Type assertions and type switches
• Type alias explained

Expressions

• Create, initialize and compare structs
• Pointers explained
• Untyped numeric constants with no limits
• Make slices, maps and channels
• How to append anything (element, slice or string) to a slice
• How to use the copy function
• [Default zero values for all Go types](https://yourbasic.org/golang/default-zero-value/ "Variables declared without an initial value are set to their zero values: 0 or 0.0 for numbers, false for booleans, "" for strings, and nil for interfaces, slices, channels, maps, pointers and functions.")
• Operators: complete list
• Conversions [complete list]

Methods and interfaces

• Methods explained
• Type, value and equality of interfaces
• Named return values [best practice]
• Optional parameters, default parameter values and method overloading
• Variadic functions (...T)

Error handling

• Error handling best practice
• 3 simple ways to create an error
• Panics, stack traces and how to recover [best practice]

Bits and pieces

• Blank identifier (underscore)
• Find the type of an object
• Generics (alternatives and workarounds)
• Pick the right one: int vs. int64
• 3 dots in 4 places
• Redeclaring variables

Standard library

• How to use JSON with Go [best practices]  encoding/json
• fmt.Printf formatting tutorial and cheat sheet  fmt
• How to use the io.Reader interface  io
• How to use the io.Writer interface  io
• Create a new image  image
• Write log to file (or /dev/null)  log
• Hello world HTTP server example  net/http
• Regexp tutorial and cheat sheet  regexp
• The 3 ways to sort in Go  sort