Golang for Beginners

This repository contains contains simple examples of Golang concepts.

Repository Overview

Below is an outline of all examples contained in this repository.

Hello World

Name	Decription
hello-world	Prints Hello world to standard output.

Interfaces

An interface specifies a method set and is a useful way to introduce modularity. It is like a blueprint for a method set.

Examples of interfaces can be found below:

Name	Description
interfaces	Two different structs that implement a common interface.

Functions

A function can take zero or more arguments.

Examples of functions can be found below:

Name	Description
anonymous	Function that does not contain a name.
defer-statement	Demonstrates defer statement.
higher-order	Calculates basic properties of a circle with example of higher order functions.
recursive	Calculates n! using recursion.
variadic	Functions that take 0 or more inputs of the same type.
examples	Contains example functions.

Pointers

A pointer holds the memory address of a value.

Examples of pointers can be found below:

Name	Description
address-and-deference	Address (&) and dereference operators (*).
declare-pointer	Declaring a pointer.
dereference-pointer	Dereference pointer.
init-pointer	Initialising pointer using different methods.
pass-by-reference	Pass by reference for different types including string, map and slice.
pass-by-value	Pass by value.

Structs

A struct is a collection of fields.

Examples of structs can be found below:

Name	Description
accessing-fields	Accessing fields within a struct.
comparing-structs	Comparing structs.
declare-struct	Declare a struct.
init-struct	Initialising a struct using different methods.
pass-struct-to-func	Passing struct to a function by reference and value.

Methods

A method is a function with a special receiver argument. The receiver appears in its own argument list between the func keyword and the method name.

Examples of methods can be found below:

Name	Description
methods	Simple method.
method-set	Method set used to interface with a struct.

Goroutines

A goroutine is a lightweight thread managed by the Go runtime.

Examples of goroutines can be found below:

Name	Description
anonymous-go-routine	Anonymous goroutine.
main-go-routine	The main goroutine.
simple-example	Simple example demonstrating a go routine.
wait-groups	An example of a WaitGroup.
print-letters-and-numbers	Using goroutines to prints letter and numbers to the screen.

Channels

Channels are a typed conduit through which you can send and receive values with the channel operater <-.

Examples of channels can be found below:

Name	Description
read-and-write	Send and receive messages on unbuffered channels.
buffered	Send and receive messages on buffered channels.
closing-a-channel	Example of closing a buffered channel.
for-range	Using a for-range to receive data from a buffered channel.
go-routine-leak	A goroutine leak cause by a goroutine that remains active indefinitely.
select-statement	Using a select statement to wait on multiple communication operations.
closure-in-a-loop	A goroutine closure executed in a for loop
time-out-code	Adding a timeout in a select statement when waiting on receiver/sender.
rx-and-tx-data-1	Sending and received data using channels.
rx-and-tx-data-2	Another example of sending and receiving data using channels.

Packages

Every go program is made up of packages. Programs start running in package main

An example package can be found below:

Name	Description
example-package	Generates a unique ID and encrypts a string and outputs to screen.

Running Locally

Assuming you are in . directory.

To run the different examples locally:

go run /path/to/main.go

For example, to run hello-world:

go run hello-world/main.go

Acknowledgements

There examples are obtained from KodeKloud's Golang for Beginners and Advanced Golang courses.