Common concurrency patterns in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a goroutine that prints "Hello".

Go

go [1]()

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Afmt.Println("Hello")

Bprintln("Hello")

Cfunc() { fmt.Println("Hello") }

Dfunc() { println("Hello") }

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to call a function directly without wrapping it in a function literal.

Using fmt.Println without importing fmt or without wrapping in a function.

The correct way is to start an anonymous function as a goroutine that calls println("Hello").

2fill in blank

medium

Complete the code to send the integer 5 into the channel ch.

Go

ch [1] 5

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A<-

B<-chan

C<-chan<-chan

D<-chan<-

Attempts:

3 left

💡 Hint

Common Mistakes

Using the receive operator incorrectly.

Confusing channel types with operators.

To send a value into a channel, use the syntax: channel <- value.

3fill in blank

hard

Fix the error in the select statement to receive from channel ch.

Go

select {
case val [1] ch:
    fmt.Println(val)
}

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A<-chan<-

B<-chan

C<-

D<-chan<-chan

Attempts:

3 left

💡 Hint

Common Mistakes

Using channel type syntax instead of the receive operator.

Confusing send and receive operators.

To receive a value from a channel in a select case, use val <- ch.

4fill in blank

hard

Fill both blanks to create a buffered channel of integers with capacity 3.

Go

ch := make(chan [1], [2])

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Aint

Bstring

C3

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using string instead of int for the channel type.

Using an incorrect buffer size.

The channel should be of type int and have a buffer size of 3.

5fill in blank

hard

Fill all three blanks to range over channel ch and print received values.

Go

for [1] := range [2] {
    fmt.[3](val)
}

Drag options to blanks, or click blank then click option'

Aval

Bch

CPrintln

DPrint

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect variable names.

Using fmt.Print instead of fmt.Println.

Use 'val' as the loop variable, 'ch' as the channel, and 'Println' to print the value.