go-essentials

go quick rampup

module1 notes

• function overloading is not allowed in go (method overloading is allowed though)
  • implies that i cant have 2 functions with same name and diff return types
• go follows pass by value, i.e, a copy is passed to the function
• go slices and arrays
  • a good detailed overview and usage guide for slices is captured at https://go.dev/blog/slices-intro. Highly recommended reading !!
  • 

go maps

Ways to initialize the map (var m map[int] string <<---- declare the map)

1. Use make. Eg: maps1 := make(map[int] string) maps1[0] = "stone"

2. Use map literal map2 := map[int] string { 1: "stone", 2: "gold", 3: "silver" }

   This can also be used to intialize an empty map as well map3 := map[int] string {}

module1 build

• Till the code was organized into folders but was not using go modules (go.mod), simpl 'go build' works - go build -o bin/module1 module1/*.go
• now, with the code organized as go modules, the way to run the code is:
  • navigate to module1
  • go run main.go

module2 notes

structs

consider a ptr to a named struct 'person, i.e, 'var ptr *person = ....'. go allowed to access the variables of person directly using '.' operator, i.e, ptr.name, ptr.age work fine. These are equivalent to (*ptr).name, (*ptr).age. This is the 'syntactic sugar' that go allows while accessing fields of a named struct when given a pointer to the named struct

Good references