# Go Modules (Go)

> go.mod, go.sum, versioning, dependencies, go get, go mod tidy, replace directives

- 18 interview questions
- Mid-Level
- [Interview Questions: Go](https://sharpskill.dev/en/technologies/go/interview-questions.md)

## 1. What is go.mod in a Go project?

**Answer**

The go.mod file is the Go module definition file. It contains the module name, required Go version and the list of direct dependencies with their versions. It is created with 'go mod init' and enables deterministic dependency management, unlike the old GOPATH.

## 2. What is the role of the go.sum file?

**Answer**

The go.sum file contains cryptographic checksums (hashes) of all direct and indirect dependencies. It ensures build integrity and reproducibility by verifying that downloaded dependencies have not been modified. Unlike go.mod which only lists direct dependencies, go.sum includes all transitive dependencies.

## 3. How to initialize a new Go module in a project?

**Answer**

The command 'go mod init <module_name>' initializes a new module by creating the go.mod file. The module name is usually the repository path (e.g. github.com/user/project). This command should be executed at the project root, only once when creating the module.

## 15 more questions available

- What does the 'go mod tidy' command do?
- What is the semantic versioning syntax in go.mod?

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