How to use Go.mod

If you are using GOPATH, you may get strange errors such as libraries that cannot be imported. I will mention it because it may be solved by using go.mod of GoModules.

[Environment]

windows10 VScode

Type go env in the terminal to check the settings

From VScode, open Terminal → New Terminal and type go env. I think that various settings will be lined up in a row, but among them ``` go111module=``` If this is the default, it is not on, so set it to on.

Turn on GO111 MODULE =

At the terminal ```go env -w go111module=on``` Let's type. If you type go env again to check It should be set GO111MODULE = on. * At this time, the author did not turn it on for some reason and did not understand the cause. Once I reinstalled the Go language, it worked.

Place go.mod

Cd to the project root directory

go mod init example.com/m


 Type.
 This will create go.mod in the root directory.
 After go.mod is created, type go build
 When you build, the library written in import will be downloaded automatically.
 The downloaded library will be written to go.mod.
 Like this ↓


#### **`[go.mod]`**
```mod]

module example.com

go 1.15

require github.com/labstack/echo/v4 v4.1.17

go.mod is created and used for each project. A file called go.sum is also automatically generated, but don't worry!

here for the explanation of the module part

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