What is Rust - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, Rust!" to the console.

Rust

fn main() {
    println!([1]);
}

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

A"Hello, Rust!"

BHello, Rust!

C'Hello, Rust!'

Dprintln!("Hello, Rust!")

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the double quotes around the string

Using single quotes instead of double quotes

Passing the text without quotes

The println! macro requires a string literal inside double quotes to print text.

2fill in blank

medium

Complete the code to declare a variable named age with the value 30.

Rust

fn main() {
    let [1] = 30;
}

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

Avar age

Bconst age

Cage

Dlet age

Attempts:

3 left

💡 Hint

Common Mistakes

Including let again inside the blank

Using var which is not Rust syntax

Using const which requires a type

In Rust, let declares a variable, so only the variable name age goes after let.

3fill in blank

hard

Fix the error in the function signature to accept a string slice parameter named name.

Rust

fn greet([1]: &str) {
    println!("Hello, {}!", name);
}

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

Aname: &str

Bname: String

Cname

D&name

Attempts:

3 left

💡 Hint

Common Mistakes

Writing only the variable name without type

Using String instead of &str

Using &name which is invalid syntax

The function parameter must include the name and its type. Here, name: &str means a string slice named name.

4fill in blank

hard

Fill both blanks to create a vector of numbers from 1 to 5 and print its length.

Rust

fn main() {
    let mut numbers = Vec::[1]();
    for i in 1..=[2] {
        numbers.push(i);
    }
    println!("Length: {}", numbers.len());
}

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

Anew

B5

Cwith_capacity

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using with_capacity without a number

Looping beyond 5

Not initializing the vector properly

Vec::new() creates an empty vector. The loop runs from 1 to 5 to add numbers.

5fill in blank

hard

Fill all three blanks to create a hash map, insert a key-value pair, and print the value for the key.

Rust

use std::collections::HashMap;

fn main() {
    let mut map = HashMap::[1]();
    map.[2]("color", "blue");
    println!("Color: {}", map.get("color").[3]());
}

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

Anew

Binsert

Cunwrap

Dpush

Attempts:

3 left

💡 Hint

Common Mistakes

Using push which is not a HashMap method

Forgetting to unwrap the Option returned by get

Not making the map mutable

HashMap::new() creates a new map. insert adds a key-value pair. unwrap() gets the value from the Option.