Match guards in Rust - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "small" when the number is less than 10.

Rust

let num = 5;
match num {
    x if x [1] 10 => println!("small"),
    _ => println!("big"),
}

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

A<

B>=

C==

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '<' in the guard.

Using '==' which only matches exactly 10.

The match guard uses '<' to check if the number is less than 10.

2fill in blank

medium

Complete the code to print "even" when the number is even using a match guard.

Rust

let num = 8;
match num {
    x if x [1] 2 == 0 => println!("even"),
    _ => println!("odd"),
}

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

A/

B%

C+

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' instead of '%' which does division, not remainder.

Using '+' or '-' which are arithmetic operators but not for checking evenness.

The '%' operator is used to find the remainder. If remainder is 0 when divided by 2, the number is even.

3fill in blank

hard

Fix the error in the match guard to correctly check if the character is a vowel.

Rust

let ch = 'a';
match ch {
    c if c == 'a' || c == 'e' || c == 'i' || c == 'o' || c [1] 'u' => println!("vowel"),
    _ => println!("consonant"),
}

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

A==

B!=

C=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of '==' in the condition.

Using '!=' which checks for inequality.

The equality operator '==' is needed to compare c with 'u'. Using '=' causes a syntax error.

4fill in blank

hard

Fill both blanks to create a match guard that matches numbers between 1 and 5 inclusive.

Rust

let num = 3;
match num {
    x if x [1] 1 && x [2] 5 => println!("between 1 and 5"),
    _ => println!("out of range"),
}

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

A>=

B<

C<=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '<=' excludes 5.

Using '>' instead of '>=' excludes 1.

The guard checks if x is greater or equal to 1 and less or equal to 5.

5fill in blank

hard

Fill all three blanks to create a match guard that matches even numbers greater than 10.

Rust

let num = 12;
match num {
    x if x [1] 2 [2] 0 && x [3] 10 => println!("even and greater than 10"),
    _ => println!("other"),
}

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

A%

B>

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '/' instead of '%' for even check.

Using '<' instead of '>' for greater than check.

Using '=' instead of '==' for comparison.

The guard uses '%' to check evenness, '>' to check greater than 10, and '==' to compare remainder to 0.