WhitneyLampkin / learning-go-lang

Repository to store code snippets and notes from the following Microsoft Learn learning path: https://docs.microsoft.com/en-us/learn/paths/go-first-steps/.

README.md

About

Repository to store code snippets and notes from the following Microsoft Learn learning path: https://docs.microsoft.com/en-us/learn/paths/go-first-steps/.

Running the App

1. cd helloworld
2. go build
3. go run main.go [int] [int]
   • Note: One of the functions expects 2 int args to be passed as seen by "[int] [int]" above. Replace these two place holders with real int values.

Topics

1. Introduction
   • What is Go?
   • Exercise - Install GO
   • Exercise - Explore the GO Playground
   • Exercise - Install Visual Studio Code and the GO extension
   • Exercise - Hello World
   • Knowledge Check
   • Summary
2. Understand how to use packages, variables, and functions in GO
   • Introduction
   • Declare and use variables
   • Learn about basic data types
   • Create functions
   • Learn about packages
   • Knowledge check
   • Summary
3. Use control flows in GO
   • Introduction
   • Test conditions with if/else expressions
   • Control flow with switch statements
   • Loop through data with for expressions
   • Control with defer, panic, and recover functions
   • Exercise - Use control flows in GO
   • Solutions - Control flow exercises
   • Knowledge check
   • Summary
4. Use data types and structs, arrays, slices, and maps in GO
   • Introduction
   • Exercise - Use arrays
   • Exercise - Explore slices
   • Exercise - Use maps
   • Exercise - Use structs
   • Challenge - Data types
   • Solution - Data types challenge
   • Knowledge check
   • Summary
5. Implement error handling and logging in GO
   • Introduction
   • Learn how to handle errors in GO
   • Learn how to log in GO
   • Knowledge check
   • Summary
6. Use methods and interfaces in GO
   • Introduction
   • Use methods in GO
   • Use interfaces in GO
   • Challenge - Methods and interfaces
   • Solution - Methods and interfaces
   • Knowledge check
   • Summary
7. Learn how concurrency works in GO
   • Introduction
   • Learn about goroutines
   • Use channels as a communication mechanism
   • Learn about buffered channels
   • Challenge
   • Solution
   • Knowledge check
   • Summary
8. Write and test a program in GO
   • Introduction
   • Outline the online bank project
   • Get started with writing tests
   • Write the bank core package
   • Write hte bank API
   • Challenge - Complete the bank project functionality
   • Solution
   • Knowledge check
   • Summary

Lessons learned from 'Take your first steps with Go'

1. Be mindful of where packages/modules are created in the directory
2. Be sure to open the scr folder from the correct $GOPATH path (This can break imports.)
3. Use go build to automatically add all dependencies to go.mod
   • go get -u github.com/whitneylampkin/learning-go-lang/[FOLDER]@master
4. [ISSUE] go run main.go resulted in error: ".\main.go:128:2: undefined: errorhandling.HandleError"
   • [SOLUTION] go clean -modcache --> go build --> go run main.go
5. Adding new packages to an EXISTING project.
   • Create new folder
   • Add *.go file w/ package [PACKAGE_NAME] as the first line
   • cd into the package's directory
   • Create a module for the package with go mod init [PACKAGE_NAME]
   • go mod tidy
   • Go to project's directory
     • go get [PACKAGE_NAME] to download the package
   • [ISSUE] undefined error, AGAIN!
   • go get [PACKAGE_NAME]@master
     • Should update the go.sum and go.mod files
   • Now go build should work without producing an error
   • go run main.go 1 2
     • SUCCESS!!! YAY!
6. go get -u updates packages and their dependencies