A Very Brief Intro to Golang

A Very Brief Intro to Golang
joshua@hauptj.com

Notable projects that use it
• Kubernetes
• Kubernetes – Helm
• Docker
• Packer
• Terraform
• Tekton

Why it exists
• Google needed a simple programming language that scaled and
performed well for distributed systems at a large scale.

Designed with simplicity in mind
• All loops are declared with for
• Composition over inheritance
• Python like array operations
• Encapsulation declared by case
• Built in garbage collection
• Package manager, linter, auto formatter, and unit testing framework
all packaged together

Composition over Inheritance
• Inheritance is not supported
type Building struct(){
Door
Name string
}
Type Door struct(){
Location string
}

Loops
• For, while and do while are all declared with for

For Loop
for i := 0; i < 10; i++ {
sum += i
}

Range
• Iterates over a slice or map
• Like for each in Python
for i range slice {
fmt.printf(i)
}

While loop
for sum < 1000 {
sum += sum
}

Variables
• A list of variables can be declared with var
• Like Javascript
• Can be set automatically, life python and JS
Number = balance(input int) int {
Return input
}

Slices
• A dynamically sized flexible view of the elements in an Array
• numbers := [6]int{1, 2, 3, 4, 5, 6}
• A[low / left : high / right]
• Like python
• var s []int = numbers[1:4]
• Output: 2, 3, 4

Short Variable Declarations
number := balance(input int) int {
Return input
}

While Loop
for sum < 1000 {
sum += sum
}

Range
• Iterates over a slice or map
• Like “for each” in Python
for i range slice {
fmt.printf(i)
}
•Iterates over a slice or map
•Like "for each" each in Python

Slices
• A dynamically sized flexible view of the elements in an Array
• numbers := [6]int{1, 2, 3, 4, 5, 6}
• A[low / left : high / right]
• Like python
• var s []int = numbers[1:4]
• Output: 2, 3, 4
•Like python
•var s []int = numbers[1:4]
•Output: 2, 3, 4

Composition over Inheritance
• Inheritance is not supported
• Like in React JS

Encapsulation
• Encapsulation is case sensitive
• Capitalized - public
• non capitialized - private

Encapsulation Example
type Building struct() {
Door
Name string
}
type Door struct() {
Location string
}

Pointers
• Holds the memory address of a value
• Like C
• However, Go does not support pointer arithmetic
• var *ptr int
• prt++

Defer
• Defers the execution of a function until the surrounding function
returns.
func main() {
Defer fmt.Println(“world”)
Fmt.Println(“hello”)
}

Unused Imports?
• Compiler will refuse to compile.
• Encourages good practices

Everything Bundled Together
• Package Manager
• go get package name
• Testing framework
• go test
• Code formatter
• go fmt

Concurrency Example
func main()
messages := make(chan string)
go func() { messages <- “Hello World” }()
msg := <- messages
fmt.Println(msg)
}

Concurrency
• Communicating Sequential Processes (CSP)
• Goroutines: “lightweight threats” that allow functions to run
concurrently
• Channels: Used to pass messages between goroutines

Recommended Resources Cont. - Testing
• A Tour of Go
• Go by Example
• Common data structures in Go
• Regular Expressions and In-Place Slice Manipulation in Go
• Traversing Directories Recursively and Sorting Objects by Attribute
Value in Go

Recommended Resources Cont.
• https://medium.com/rungo/unit-testing-made-easy-in-go-
25077669318
• https://medium.com/rate-engineering/go-test-your-code-an-
introduction-to-effective-testing-in-go-6e4f66f2c259

A Very Brief Intro to Golang

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