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If let expression in Rust
An if let expression in Rust is slightly different from an if expression in Rust. if let includes the let keyword followed by a pattern, a = sign, and an expression. If the expression matches the pattern, then the following block of code is executed. If it does not match, then the else block of code is executed.
Syntax
The syntax for the if let expression is:
if let PATTERN = EXPRESSION {
/* block of code in case PATTERN MATCHES THE EXPRESSION
*/
} else {
/* block of code in case PATTERN DOES NOT MATCH THE EXPRESSION
*/
}
Code
The code snippet below illustrates how the if let expression can be used in Rust:
fn main() {let fruits = ("Apple", "Banana");// Pattern does not match the expression because Orange// is not part of fruitsif let ("Orange", y) = fruits {println!("Orange is served with {}", y);} else {// So this piece of code executes instead.println!("No Oranges available");}// Pattern matches the expression because Apple// is part of fruitsif let ("Apple", y) = fruits {println!("Apple is served with {}", y);}}
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