Array length in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the length of the array.

Go

package main
import "fmt"
func main() {
	arr := [5]int{1, 2, 3, 4, 5}
	fmt.Println(len([1]))
}

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Aarr

Barray

Clen

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'array' instead of 'arr'.

Passing a number instead of the array variable.

Using 'len' as the argument inside len().

The len() function returns the length of the array. We pass the array variable 'arr' to len().

2fill in blank

medium

Complete the code to store the length of the array in a variable.

Go

package main
import "fmt"
func main() {
	nums := [3]int{10, 20, 30}
	length := [1](nums)
	fmt.Println(length)
}

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Asize

Blen

Ccount

Dcap

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'cap' which returns capacity, not length.

Using undefined functions like 'size' or 'count'.

The built-in function len() returns the length of the array.

3fill in blank

hard

Fix the error in the code to correctly print the length of the array.

Go

package main
import "fmt"
func main() {
	values := [4]int{5, 6, 7, 8}
	fmt.Println([1](values))
}

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Alength

Bsize

Clen

Dcount

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'size' or 'length' which are not built-in functions in Go.

Trying to access a property like values.length which does not exist.

The correct function to get the length of an array in Go is len().

4fill in blank

hard

Fill both blanks to create a map with words as keys and their lengths as values, but only for words longer than 3 characters.

Go

package main
import "fmt"
func main() {
	words := []string{"go", "code", "play", "fun"}
	lengths := map[string]int{
		[1]: [2],
	}
	fmt.Println(lengths)
}

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A"code"

Blen("code")

C"go"

Dlen("go")

Attempts:

3 left

💡 Hint

Common Mistakes

Using words shorter than or equal to 3 characters.

Not using len() to get the length.

We add the word "code" as key and its length len("code") as value. Only words longer than 3 characters are included.

5fill in blank

hard

Fill all three blanks to create a map of words to their lengths, including only words longer than 2 characters.

Go

package main
import "fmt"
func main() {
	words := []string{"go", "play", "fun", "code"}
	lengths := map[string]int{
		[1]: [2],
		[3]: len("code"),
	}
	fmt.Println(lengths)
}

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A"play"

Blen("play")

C"code"

D"go"

Attempts:

3 left

💡 Hint

Common Mistakes

Including words that are too short.

Not matching keys with their correct lengths.

We add "play" with its length len("play") and "code" with its length len("code") is already given. "go" is excluded because it is not longer than 2 characters.