• Go Practice
  • Table of Contents
  • Roadmap
  • Notes
  • Specific Things
    • Keyword defer
    • Goroutines

• Syntax
• Conditional branches
• Functions
• Arrays
• Maps
• Loops
• Structs
• Interfaces
• Pointers
  • Pass by Reference
• Channels
• Generics
• Unit test basics
• Go for embedded

Specific Things

• Keyword: defer
• Goroutines
• tidy and vendor

• len() returns the byte size of a string. So if char is not in ASCII table it could stored as more than one byte.
• If you don't specify the length of the array, it will be a slice
• Use make() to initialize things with declaring capacity
• Go has only one looping construct, the for loop
  • But for loop can be used as "regular for loop", "while", or "foreach"
• Map always returns value even if the key doesn't exist
  • But it returns a second value to indicate if key exists.
• Switch cases can be used with or without variables. If variable isn't passed, it can be used like if branch.
• Functions can return more than one value

• You can also make in-line structs that can be used one time.
• Interfaces is similar to abstract classes in C++
• Pointers are exactly like C
• Select-case statement is if statements for channels
• See testing package docs.
  • Test files naming convention need to be snake-case
  • Test function naming convetion need to be pascal-case

• A defer statement defers the execution of a function until the surrounding function returns
  • souce here

• concurrency != parallel execution

• For example:

  • Program can execute other processes while waiting for database to respond

• Device need to have a multicore CPU to execute processes in parallel

• Usage

  • use go keyword to use goroutines (async functions)
  • import sync
    • use WaitGroup: a counter for tasks
    • use wg.Add(1) before using async method to increment wait group
    • use wg.Done() to indicate the task is ended and decrease the counter
    • use wg.Wait() to wait till wait group has ended so the rest of the program can continue executing

• Example code

  • Example implemented here