basics

Question 1

Front

Answer 1

Back

Question 2

How do you declare a variable in Go?

Answer 2

var x int = 42

Question 3

What’s the short variable declaration syntax in Go?

Answer 3

x := 42

Question 4

How do you define a function in Go?

Answer 4

func add(a int, b int) int { return a + b }

Question 5

How do you define a struct in Go?

Answer 5

type Person struct { Name string; Age int }

Question 6

How do you write a for loop in Go?

Answer 6

for i := 0; i < 10; i++ { fmt.Println(i) }

Question 7

How do you create a slice from an array in Go?

Answer 7

slice := arr[1:4]

Question 8

How do you return multiple values from a function in Go?

Answer 8

a, b := myFunc()

Question 9

How do you define an interface in Go?

Answer 9

type Reader interface { Read(p []byte) (n int, err error) }

Question 10

How do you write a switch statement in Go?

Answer 10

switch x := time.Now().Weekday(); x { case time.Saturday: … }

Question 11

How do you defer a function call in Go?

Answer 11

defer fmt.Println(“done”)

Question 12

Front

Answer 12

Back

Question 13

How do you declare a variable in Go?

Answer 13

var x int = 42

Question 14

What’s the short variable declaration syntax in Go?

Answer 14

x := 42

Question 15

How do you define a function in Go?

Answer 15

func add(a int, b int) int { return a + b }

Question 16

How do you define a struct in Go?

Answer 16

type Person struct { Name string; Age int }

Question 17

How do you write a for loop in Go?

Answer 17

for i := 0; i < 10; i++ { fmt.Println(i) }

Question 18

How do you create a slice from an array in Go?

Answer 18

slice := arr[1:4]

Question 19

How do you return multiple values from a function in Go?

Answer 19

a, b := myFunc()

Question 20

How do you define an interface in Go?

Answer 20

type Reader interface { Read(p []byte) (n int, err error) }

Question 21

How do you write a switch statement in Go?

Answer 21

switch x := time.Now().Weekday(); x { case time.Saturday: … }

Question 22

How do you defer a function call in Go?

Answer 22

defer fmt.Println(“done”)

Question 23

How do you declare a constant in Go?

Answer 23

const Pi = 3.14

Question 24

How do you create a map in Go?

Answer 24

m := map[string]int{“foo”: 1, “bar”: 2}

Question 25

How do you check if a key exists in a map?

Answer 25

val, ok := m["key"]

Question 26

How do you define an anonymous function?

Answer 26

f := func(x int) int { return x * x }

Question 27

What does the blank identifier `_` do in Go?

Answer 27

It ignores a value, often used to discard return values.

Question 28

How do you create a goroutine?

Answer 28

go someFunction()

Question 29

How do you create a channel?

Answer 29

ch := make(chan int)

Question 30

How do you send and receive values on a channel?

Answer 30

ch <- 1 (send), val := <-ch (receive)

Question 31

What is the purpose of `select` in Go?

Answer 31

It waits on multiple channel operations.

Question 32

How do you recover from a panic?

Answer 32

Use `defer` and `recover()` inside a function.