By Shiju Varghese
Remedy your move difficulties utilizing a problem-solution technique. each one recipe is a self-contained solution to a pragmatic programming challenge in pass. move Recipes comprises recipes that care for the basics of move, permitting you to construct easy, trustworthy, and effective software program. different themes comprise operating with information utilizing sleek NoSQL databases equivalent to MongoDB and RethinkDB. The publication offers in-depth tips for construction hugely scalable backend APIs in opt for your cellular customer purposes and internet customer functions. All which means you’ll be capable of write courses that get the main out of multicore and networked machines, utilizing Go’s novel sort approach that permits versatile and modular application building. Youll see how you can attempt your move functions in order that they are prepared for deployment, in addition to studying the best way to write HTTP servers to supply you greatest flexibility whilst facing distant consumers. What Youll research paintings with the middle basics of move Persist information into NoSQL databases construct scalable backend APIs try out your move functions Create HTTP net servers in move
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Listing 2-3 shows an example program that declares two functions and calls it from a main function. Listing 2-3. Println("[Subtract]:", result) } In this program, two functions are declared: Add and Subtract. These two functions are called from the main function. 28 CHAPTER 2 ■ GO FUNDAMENTALS You should see the following output when you run the program: [Add]: 30 [Subtract]: 10 Naming Return Values When you write functions, you can name the return values by defining variables at the top of the function.
The Go tool is a very important component for a Go programmer. It allows you to format, build, install, and test Go packages and commands. We used the Go tool in the previous sections of this chapter to compile, install, and run Go packages and commands. Run the go help command to obtain documentation on the go command. Here is the documentation for the various subcommands provided by the go command: Go is a tool for managing Go source code. Usage: go command [arguments] The commands are: build clean doc env compile packages and dependencies remove object files show documentation for package or symbol print Go environment information 15 CHAPTER 1 ■ BEGINNING GO fix fmt generate get install list run test tool version vet run go tool fix on packages run gofmt on package sources generate Go files by processing source download and install packages and dependencies compile and install packages and dependencies list packages compile and run Go program test packages run specified go tool print Go version run go tool vet on packages Use "go help [command]" for more information about a command.
Println("Slice y after adding elements:", y) } You should see the following output when you run the program: [Slice:x] Length is 3 Capacity is 3 [Slice:y] Length is 5 Capacity is 10 Slice y after copying: [10 20 30 0 0] Slice y after adding elements: [10 20 30 40 50] A slice x is created with a length of 3 and capacity of 3. To increase the capacity and add more elements to the slice, a new slice y is created with a length of 5 and capacity of 10. The copy function then copies data from slice x to the destination slice y.