Show-Me-How video tutorials demonstrate key Write: OutLoud 6 functions in less than a minute each.
How to Write Go Code Introduction This document demonstrates the development of a simple Go package and introduces the go toolthe standard way to fetch, build, and install Go packages and commands.
The go tool requires you to organize your code in a specific way. Please read this document carefully. It explains the simplest way to get up and running with your Go installation.
A similar explanation is available as a screencast. Code organization Go programmers typically keep all their Go code in a single workspace. A workspace contains many version control repositories managed by Git, for example. Each repository contains one or more packages.
Each package consists of one or more Go source files in a single directory. Note that this differs from other programming environments in which every project has a separate workspace and workspaces are closely tied to version control repositories.
Workspaces A workspace is a directory hierarchy with two directories at its root: The go tool builds and installs binaries to the bin directory.
The src subdirectory typically contains multiple version control repositories such as for Git or Mercurial that track the development of one or more source packages.
The tree above shows a workspace containing two repositories example and image. The example repository contains two commands hello and outyet and one library stringutil.
The image repository contains the bmp package and several others. A typical workspace contains many source repositories containing many packages and commands. Most Go programmers keep all their Go source code and dependencies in a single workspace. Note that symbolic links should not be used to link files or directories into your workspace.
Commands and libraries are built from different kinds of source packages. We will discuss the distinction later. Import paths An import path is a string that uniquely identifies a package. For your own packages, you must choose a base path that is unlikely to collide with future additions to the standard library or other external libraries.
If you keep your code in a source repository somewhere, then you should use the root of that source repository as your base path.
For instance, if you have a GitHub account at github. In practice you can choose any arbitrary path name, as long as it is unique to the standard library and greater Go ecosystem. Create a directory inside your workspace in which to keep source code: The go tool finds the source code by looking for the github.
You can also omit the package path if you run go install from the package directory: The go tool will only print output when an error occurs, so if these commands produce no output they have executed successfully.
You can now run the program by typing its full path at the command line: Again, this step is optional: Instead it saves the compiled package in the local build cache. After confirming that the stringutil package builds, modify your original hello. Running the new version of the program, you should see a new, reversed message: After the steps above, your workspace should look like this: All files in a package must use the same name.
Executable commands must always use package main.
There is no requirement that package names be unique across all packages linked into a single binary, only that the import paths their full file names be unique. Testing Go has a lightweight test framework composed of the go test command and the testing package.
The test framework runs each such function; if the function calls a failure function such as t.This document demonstrates the development of a simple Go package and introduces the go tool, the standard way to fetch, build, and install Go packages and commands.
The go tool requires you to organize your code in a specific way. Please read this document carefully. It explains the simplest way to.
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Build up a string variable that you can use later Type variable name here.