Rust If Expression

Rust if expression

Created By: chatGPT

Rust provides the powerful if expression to handle conditional logic in your programs. Unlike traditional imperative languages, Rust treats if as an expression, meaning that it can return a value. This feature allows for more concise and expressive code. Here's a basic example illustrating how the if expression works:

let number = 6;
let result = if number % 2 == 0 {
    "Even"
} else {
    "Odd"
};

println!("The number is {}.", result);

In this code snippet, we declare a variable number and then use an if expression to determine if it is even or odd. Depending on the condition, it assigns either "Even" or "Odd" to the variable result. Finally, we use println! to display the result.

let number = 9;
let result = if number > 0 {
    "Positive"
} else if number < 0 {
    "Negative"
} else {
    "Zero"
};

println!("The number is {}.", result);

You can also chain multiple conditions using else if. In this example, we check if a number is positive, negative, or zero. The if expression here evaluates the first true condition and assigns the corresponding value to result.

let a = 20;
let b = 30;
let max = if a > b {
    a
} else {
    b
};

println!("The maximum number is {}.", max);

Moreover, if expressions can return values of different types, as long as they are of the same type. In this case, we evaluate which of two numbers, a or b, is larger, and we store that value in the variable max. This shows the versatility and power of if expressions in Rust.