Introduction

Question 1

Why was go invented?

Answer 1

Because google had three languages that had its own strengths but did completely solve google’s problem.

Question 2

Which languages google was having issues with and why?

Answer 2

C++, Java, Python. For full comparison see here:

https://pasteboard.co/JLkSwPz.png

Question 3

What are the 6 key advantages of go?

Answer 3

Fast compilation time. Fully compiled. Strongly typed. Concurrent by default. Garbage collected. Simplicity as a core value.

Question 4

Will go try to infer the type even keeping its “strongly typed” characteristic?

Answer 4

Yes.

Question 5

What are the 3 applications-types that go is very good at?

Answer 5

web services, web applications and task automation

Question 6

Is there a web playground for go?

Answer 6

yes. play.golang.org

Question 7

what is the package main in a go program?

Answer 7

main namespace of the application. this is the root.

Question 8

what is the import (“fmt”) command do?

Answer 8

import fmt lib

Question 9

how does the entrypoint method of a go app looks like?

Answer 9

func main() {
}

Question 10

what happens when you import a lib and doesn’t use it or any other kind of “unused” resource?

Answer 10

go is going to complaint and throw compilation error.

Question 11

why does go throws a compilation error when a lib is imported but not used?

Answer 11

to improve maintainability.

Question 12

how is go formatted? empty spaces or tabs? Does it throw an error if not followed?

Answer 12

tabs. no

Question 13

where the curly brace has to be added? What happens if not?

Answer 13

to the same line of the statement, otherwise compilation error.

Question 14

what does go doc method/class/package?

Answer 14

show the documentation about the method

Question 15

How to install all important dependencies via vs code?

Answer 15

install the go plugin, then ctrl P, then > go install, finally check them all and install

Question 16

how these libs look like in windows drive?

Answer 16

they are all executables

Question 17

will the plugin import automatically libraries?

Answer 17

yes

Question 18

what is a workspace?

Answer 18

legacy way to organize the projects.

Question 19

what is a module? which version of go was it introduces? what was deprecated in favor of modules?

Answer 19

the new way to organize projects. was introduced on 1.0.3. workspace was deprecated.

Question 20

how to initialize a go module? which file does it create?

Answer 20

go mod init github.com/pluralsight/webservice

go.mod

Question 21

why does a go module looks like an URL?

Answer 21

to simplify dependency management.

Question 22

Should I write procedural or object oriented with go?

Answer 22

you decide… go is multi-paradigm

Question 23

how many loop keywords are available in golang?

Answer 23

only one: for (in three different flavors but only one reserved word)

Question 24

Who starts the goroutines concurrent tasks?

Answer 24

The scheduler

Question 25

What is the purpose of net and net/http packages?

Answer 25

Create web servers using only the standard library.

Question 26

What is the purpose of the goroutines?

Answer 26

Start thousands of concurrent tasks with minimal resources.

Question 27

What is the purpose of channels?

Answer 27

Safely communication between concurrent tasks (goroutines).

Question 28

What is the main purpose of the standard library?

Answer 28

Provides the whole “out of the box experience” where you can build quite a lot of apps only using this lib.

Question 29

What are the main tasks you can achieve with the go cli?

Answer 29

project init, build, retrieve deps, tests, profiling, documentation and more.

Question 30

How can I compile a go program into android?

Answer 30

Just change the GOOS and GOARCH env vars to android and arm respectively

Question 31

How does go handle forward and backward slashes within the cross-platform topic?

Answer 31

The compiler does it for you automatically based on the GOOS.

Question 32

Is backwards compatibility a concern on go?

Answer 32

Yes, promised. Any app written to a specific major version will continue to work (even unchanged) when updating to the latest minor.

Question 33

Can go break backwards compatibility promise?

Answer 33

Yes, for security, unspecified behavior, spec errors and bugs.

Question 34

What is an “*” in golang? How to access this value?

Answer 34

Means it is a pointer to the value. *myVar

Question 35

What does the defer keyword does?

Answer 35

Flags that a variable/resource can be cleaned up (open handles in case of os.Open()

Question 36

Why does golang sometimes requires an array of byte as params for specific methods suas as http.ResponseWritter.Write?

Answer 36

Because it is closed to the computer “language”.

Question 37

How to convert a string to an array of bytes?

Answer 37

[]byte(“My String”)

Question 38

What is the main page of golang to keep myself up to date?

Answer 38

golang.org

Question 39

What is the official blog of golang?

Answer 39

blog.golang.org

Question 40

What is the official FAQ of the language?

Answer 40

golang.org/doc/faq

Question 41

Is there a podcast about golang where experts talks about updates?

Answer 41

yes, check it out at golang.org/help

Question 42

What are the three main advices to learn go?

Answer 42

create projects with go (write lots of code), join slack and discord channels, checkout the pluralsight library.

Question 43

What is the main goal of the go programming language?

Answer 43

To make programmers more productive

Question 44

Is go open source?

Answer 44

Yes.

Question 45

What are some characteristics of the go language?

Answer 45

Very efficient (fast compilation and binaries), clean (few keywords to memorize), expansive