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if

The if keyword begins a conditional branch. It evaluates an expression and runs the following block only when the expression is truthy. It may be followed by elif and else.

Syntax & Example​

let score = 85;
if score >= 90 {
    print("A");
} elif score >= 80 {
    print("B");
} else {
    print("C");
}
// As an expression
let parity = if n % 2 == 0 { "even" } else { "odd" };

Use Cases​

  • Branching on a boolean condition.
  • Forming multi-branch ladders with elif/else.
  • Producing values conditionally when used as an expression.

See also: Control Flow.