Importing packages in Go

Introduction

Importing packages lets you use code others wrote so you don't have to start from scratch.

When you want to use functions to work with strings or numbers.

When you need to read or write files on your computer.

When you want to create a web server or handle internet requests.

When you want to organize your own code into smaller parts.

When you want to use tools for formatting or printing output.

Syntax

Go

import "package_name"

// or to import multiple packages
import (
    "package_one"
    "package_two"
)

Use double quotes around the package name.

You can import one package or many packages inside parentheses.

Examples

Imports the fmt package to print text to the screen.

Go

import "fmt"

Imports both fmt and math packages to use their functions.

Go

import (
    "fmt"
    "math"
)

Imports fmt package but uses alias as its name in code.

Go

import alias "fmt"

Sample Program

This program imports the fmt package to print a message to the screen.

Go

package main

import "fmt"

func main() {
    fmt.Println("Hello, importing packages!")
}

Important Notes

Always import packages at the top of your Go file.

If you import a package but don't use it, Go will give an error.

Use aliases to avoid name conflicts or shorten long package names.

Summary

Import packages to reuse code others wrote.

Use import with package names in quotes.

Multiple packages can be imported inside parentheses.