Creating custom packages in Go - Quick Revision & Summary

Recall & Review

beginner

What is a package in Go?

A package in Go is a way to organize and reuse code. It groups related functions, types, and variables together in one place.

beginner

How do you create a custom package in Go?

To create a custom package, make a folder with your package name, write Go files starting with 'package packagename', and then use 'import' to use it in other files.

beginner

Why should package names be short and lowercase?

Short and lowercase package names are easier to type and remember. They also follow Go's style guidelines for readability and consistency.

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How do you make a function accessible outside its package?

Start the function name with a capital letter. This makes it exported and usable by other packages.

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What is the purpose of the 'import' statement in Go?

The 'import' statement lets you use code from other packages, including your custom packages, by bringing their names and functions into your file.

What keyword starts a Go source file to define its package?

A func

B import

C package

D var

Every Go file begins with the 'package' keyword followed by the package name.

How do you use a custom package in another Go file?

A By using 'include' keyword

B By writing 'import "packagename"' at the top

C By copying the code manually

D By running 'go use packagename'

You import the package using the 'import' statement with the package path or name.

Which function name is exported and accessible outside its package?

A CalculateSum

B calculateSum

C calculate_sum

D _CalculateSum

In Go, functions starting with a capital letter are exported and accessible outside their package.

Where should you place your custom package files?

A In a folder named after the package

B Anywhere on your computer

C In the main Go installation folder

D Inside the 'bin' folder

Custom package files should be inside a folder named after the package for Go to recognize them properly.

What is the recommended style for package names?

A Long and descriptive with uppercase letters

B With underscores

C CamelCase

D Short and lowercase

Go style recommends short, lowercase package names for simplicity and clarity.

Explain how to create and use a custom package in Go.

Think about folder structure, naming, exporting, and importing.

Why is it important to export functions in a package, and how do you do it?

Focus on function naming and visibility.