Home » Rust » Rust Programs

Rust program to demonstrate the 'from' trait

Rust Example: Write a program to demonstrate the "from" trait.
Last Updated : November 27, 2021

Problem Statement

In this program, we will demonstrate the "from" trait. The "from" trait is used to create a variable from another type of variable.

Program/Source Code

The source code to demonstrate the "from" trait is given below. The given program is compiled and executed successfully.

// Rust program to demonstrate the "from" trait

fn TypeOf<T>(_: &T) {
    println!("{}", std::any::type_name::<T>())
}

fn main() 
{
    let strVar = "hello world";
    let stringVar = String::from(strVar);

    print!("{}, Type: ",strVar);
    TypeOf(&strVar); 
    
    print!("{}, Type: ",stringVar);
    TypeOf(&stringVar); 
}

Output

hello world, Type: &str
hello world, Type: alloc::string::String

Explanation

Here, we created  a variable strVar  of &str type. Then we created another variable stringVar using the "from" trait using the existing variable strVar. After that, we printed the value of variables and their data type.

Rust Miscellaneous Programs »