Assign this or that in Rust 1.55

In Rust 1.55, the if-else expression can be used to assign either this value or that value, depending on a condition. Here's an example:

let condition = true;
let result = if condition {
    "this"
} else {
    "that"
};
println!("{}", result);

In this example, the variable condition is set to true, which means the if block will be executed. The if block returns the string "this", which is then assigned to the variable result.

If condition was instead set to false, the else block would be executed, and the string "that" would be assigned to result.

This syntax can also be used with more complex expressions. Here's an example of using the if-else expression to assign a value based on the length of a vector:

let numbers = vec![1, 2, 3];
let result = if numbers.len() > 2 {
    "long"
} else {
    "short"
};
println!("{}", result);

In this example, the if block will be executed if the length of the numbers vector is greater than 2. If it is, the string "long" will be assigned to result. Otherwise, the string "short" will be assigned to result.