Notes

• Every Go program is made up of functions contained in packages.
• To print text on the screen, use the fmt package provided by the standard library.
• Go supports characters of every language. Print text in Chinese, Japanese, Russian, or Spanish...
• With Printf and the %v format verb, values can be placed anywhere in the displayed text.
• Constants are declared with the const keyword and can’t be changed.
• Variables are declared with var and can be assigned new values while a program is running.
• The math/rand import path refers to the rand package.
• The Intn function in the rand package generates pseudorandom numbers.
• Booleans are the only values that can be used in conditions.
• Go provides branching and repetition with if, switch, and for.
• An opening curly brace { introduces a new scope that ends with a closing brace }.
• The case and default keywords also introduce a new scope even though no curly braces are involved.
• The location where a variable is declared determines which scope it’s in.
• Not only is shortcut declaration shorter, you can take it places where var can’t go.
• Variables declared on the same line as a for, if, or switch are in scope until the end of that statement.
• A wide scope is better than a narrow scope in some situations—and vice versa.

• UDP server => func ListenPacket(network, address string) (PacketConn, error)

Useful Commands

• go doc net.IP
• go doc net.ParseIP
• go test -list ".ParseIP." $(go env GOROOT)/src/net
• go test -run ParseIP -bench ParseIP -count=1 $(go env GOROOT)/src/net
• grep -l TestParseIP -nr $(go env GOROOT)/src/net
• go doc net.Dial
• go doc -u net.protocols
• go doc net | grep Lookup
• go test -test.v -run "Timeout|KeepAlive" -count=1 $(go env GOROOT)/src/net
• go test -list "Timeout|KeepAlive" $(go env GOROOT)/src/net