Installing the MongoDB Go Driver
Resources
https://docs.mongodb.com/drivers/go/current/
https://docs.mongodb.com/manual/tutorial/install-mongodb-on-windows/
Category: Go
Categories
Go Online Book (Free)
Official Go download page, this link gives you more option to choose from OS platform and OS architecture x86-64 build. And you can use the go build command parameter to building a binary for an application that can run for CPU of x86 (386) and x86-64.
Install
Open the MSI file you downloaded and follow the prompts to install Go. The default folder used is C:/go. Or choose any folder that Windows 10 security may not ask for an administrator password for install programs/files using that folder path.
System Environment variable created by MSI installer
GOPATH C:\Users\loginname\go
Note: loginname is the user name to Window login
PATH C:\Go\bin
Verify
Launch a windows terminal, type go version
go version go1.15.6 windows/amd64 output confirmed go installation has been successful. Otherwise, use the Windows Control panel app -> Programs find go1.15.6 has been program has been installed.
Troubleshooting
Google, Go forum, and Stackoverflow for assistance.
Categories
Range Over Slice and Map
package main
import "fmt"
func main() {
kvs := map[string]string{"1":"shan kuo","2":"Hoi Leng","3":"Choi Yan","4":"Evelyn Chan"}
for k, v := range kvs {
fmt.Printf("%s -> %s\n",k,v)
}
}https://repl.it/join/gdzplzna-shankuo
go build
./main
1 -> shan kuo
2 -> Hoi Leng
3 -> Choi Yan
4 -> Evelyn Chan
Categories
Looping Over Arrays and Slices
package main
import "fmt"
func main() {
names := []string{"Shank Kuo","Hoi Leng","Choi Yan","Evelyn Chan"}
for i:=0; i < len(names); i++ {
fmt.Println(names[i])
}
}https://repl.it/@shankuo/LoopArraySlice
go version go1.14 linux/amd64
go run main.go
Shank Kuo
Hoi Leng
Choi Yan
Evelyn Chan
Naming conventions ( prefix with underscore)
suffix with underscore with the filename. For example, the hello.go is the source file then hello.go with test package will have the filename hello_test.go tells the go test command that this file contains test functions.
hello_test.go
Testing package
Importing the testing package is a must to be included along with other imported packages such as the “fmt” package that it commonly in use.
import (
"testing"
)Test command
At the command line where the source code directory, run the go test command to execute the test
go test
Implement a Test Functions
Expect results of the function
Prefix the Test to the function name. For example, TestHelloName()
// TestHelloName calls greetings.Hello with a name, checking
// for a valid return value.
func TestHelloName(t *testing.T) {
name := "Gladys"
want := regexp.MustCompile(`\b`+name+`\b`)
msg, err := Hello("Gladys")
if !want.MatchString(msg) || err != nil {
t.Fatalf(`Hello("Gladys") = %q, %v, want match for %#q, nil`, msg, err, want)
}
}
Resources
Categories
Fyne Cross-Platform GUI
Fyne is an easy to use UI toolkit and app API written in Go. It is designed to build applications that run on desktop and mobile devices with a single codebase.
Setup the Fyne development environment
- Go compiler installed and setup (1.16)
- IDE – Visual Studio Code
- C compiler installed (MSYS2 MinGW 64-bit)
- Git Fyne
C compiler installation with MSYS2 MinGW 64-bit
The steps for installing with MSYS2 (recommended) are as follows:
- Install MSYS2 from msys2.org
- Once installed do not use the MSYS terminal that opens
- Open “MSYS2 MinGW 64-bit” from the start menu
- Execute the following commands:
$ pacman -Syu
$ pacman -S git mingw-w64-x86_64-toolchain
go get fyne.io/fyneResources