Brief Programming languages have the notion of constants which means “variables that can not be mutated once declared and initialized”. Go also has almost the same meaning, but in a different context. To initialize a variable as a constant with a value of 10, we can do something like this: const DISCOUNT = 10 In Go, constants mean “storing a literal to a variable”, this can be seen as a version of pattern matching in Erlang....
Brief Although Go releases are incremental and follow the Go compatibility promise: unless the change is required for a bug or security fix, the version starting with 1 won’t experience any backward-breaking change to the language or standard library, you can have a reason to use an old version of the language. Is there a clean way to do this? Recommendation I recommend a tool like go version manager that helps to manage a systemwide version of the language....
First, install CompileDaemon: $ go get github.com/githubnemo/CompileDaemon && go install github.com/githubnemo/CompileDaemon Then, from the root of the project, create a Make file: $ touch Makefile And add the below content: GOCMD ?= go GOBUILD = $(GOCMD) build GOCLEAN = $(GOCMD) clean GOTEST = $(GOCMD) test GOGET = $(GOCMD) get BINARY_NAME = project_name BINARY_UNIX = $(BINARY_NAME)_unix default: all all: test build build: $(GOBUILD) -o ../$(BINARY_NAME) -v -ldflags="-X main.VERSION=$(TAG)" test: $(GOTEST) -v ....