Applying Closure to a given number in Rust

Last update on June 10 2025 13:05:17 (UTC/GMT +8 hours)

Write a Rust function that takes a closure as an argument and applies it to a given number.

Sample Solution:

Rust Code:

// Define a function that takes a closure as an argument
fn apply_closure<F: FnOnce(i32) -> i32>(num: i32, closure: F) -> i32 {
    // Call the closure with the given number and return the result
    closure(num)
}

fn main() {
    // Define a closure that squares a number
    let square_closure = |x| x * x;

    // Apply the closure to a given number
    let result = apply_closure(12, square_closure);

    // Print the result
    println!("Result: {}", result); // Output: Result: 144
}

Output:

Result: 144

Explanation:

The above Rust code defines a function called "apply_closure()" that takes two arguments: 'num', an integer, and 'closure', a closure that takes an integer and returns an integer. Inside the function, it calls the closure with the given number 'num' and returns the result.

In the main function,

A closure "square_closure" is defined using the |x| x * x syntax, which squares a given number.
The "apply_closure()" function is called with arguments 12 and 'square_closure'. This applies "square_closure" to 12.
The result of applying closure to 12 is stored in the 'result' variable.
The result is printed to the console using "println!()".

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