Golang Hands-On Exercises #01 PDF

Todd McLeod - Learn To Code Golang Hands-On Exercises #01 composite literal; slice literal https://play.golang.org/p/nGekFavi0S for range loop & index position https://play.golang.org/p/1fzbabuaWD composite literal; map literal https://play.golang.org/p/kHmQmHwK_c print map value without u...

Todd McLeod - Learn To Code Golang Hands-On Exercises #01 composite literal; slice literal https://play.golang.org/p/nGekFavi0S for range loop & index position https://play.golang.org/p/1fzbabuaWD composite literal; map literal https://play.golang.org/p/kHmQmHwK_c print map value without using second return in for range https://play.golang.org/p/HvzecFdZPG answer https://play.golang.org/p/WE8V3YoXu8 https://play.golang.org/p/_qPtpHASLS using “make” to make a map https://play.golang.org/p/3FDj-UtWru composite literal; struct literal https://play.golang.org/p/cgc0Na2zhS Todd McLeod - Learn To Code Golang - Hands-On Exercises #1 Page 1 func https://play.golang.org/p/vsblP3PmTc func (receiver) identifier(parameters) (returns) { } methods - receivers make methods https://play.golang.org/p/XezUp4hdE6 trip out https://play.golang.org/p/3nd8m4oHNR interfaces https://play.golang.org/p/4kN4P9C2AW // HANDS ON 1 // create a type square // create a type circle // attach a method to each that calculates area and returns it // create a type shape which defines an interface as anything which has the area method // create a func info which takes type shape and then prints the area // create a value of type square // create a value of type circle // use func info to print the area of square // use func info to print the area of circle https://play.golang.org/p/1enChb7Kg5 // HANDS ON 2 // create a struct that holds person fields // create a struct that holds secret agent fields and embeds person type // attach a method to person: pSpeak // attach a method to secret agent: saSpeak Todd McLeod - Learn To Code Golang - Hands-On Exercises #1 Page 2 // create a variable of type person // create a variable of type secret agent // print a field from person // run pSpeak attached to the variable of type person // print a field from secret agent // run saSpeak attached to the variable of type secret agent // run pSpeak attached to the variable of type secret agent SOLUTION: https://play.golang.org/p/RxrkCJw9Cd // HANDS ON 3 create an interface type that both person and secretAgent implement declare a func with a parameter of the interface’s type call that func in main and pass in a value of type person call that func in main and pass in a value of type secretAgent https://play.golang.org/p/-Ux0gHf4SF solution & optional additional info not necessary to know: assertions https://play.golang.org/p/0TX4o-u-_B package main import ( "io" "net/http" ) Todd McLeod - Learn To Code Golang - Hands-On Exercises #1 Page 3 func foo(res http.ResponseWriter, req *http.Request) { io.WriteString(res, "foo ran") } func bar(res http.ResponseWriter, req *http.Request) { io.WriteString(res, "bar ran") } func main() { http.HandleFunc("/", foo) http.HandleFunc("/dog/", bar) http.ListenAndServe(":8080", nil) } string / slice of byte []byte https://play.golang.org/p/nI3morIwoO Todd McLeod - Learn To Code Golang - Hands-On Exercises #1 Page 4