What is concurrency

• Concurrency is the capability to deal with lots of things at once.
• Let's consider a person jogging.
• During his morning jog, lets say his shoe laces become untied.
• Now the person stops running, ties his shoe laces and then starts running again.
• This is a classic example of concurrency.
• The person is capable of handling both running and tying shoe laces, that is the person is able to deal with lots of things at once

What is parallelism and how is it different from concurrency?

• Parallelism is doing lots of things at the same time.
• lets assume that the person is jogging and also listening to music in his iPod.
• In this case the person is jogging and listening to music at the same time, that is he is doing lots of things at the same time.
• This is called parallelism.

What is an interface?

• When a type provides definition for all the methods in the interface, it is said to implement the interface
• WashingMachine can be an interface with method signatures Cleaning() and Drying().
• Any type which provides definition for Cleaning() and Drying() methods is said to implement the WashingMachine interface.

Empty interface

• An interface that has zero methods is called an empty interface.
• It is represented as interface{}.
• Since the empty interface has zero methods, all types implement the empty interface.

Methods in Go

• A method is just a function with a special receiver type between the func keyword and the method name
• Methods with the same name can be defined on different types whereas functions with the same names are not allowed.
• Let's assume that we have a Square and Circle structure.
• It's possible to define a method named Area on both Square and Circle.

rune

• Rune literals are just 32-bit integer values (however they're untyped constants, so their type can change).
• They represent unicode codepoints.
• For example, the rune literal 'a' is actually the number 97