Skip to main content

not

The not keyword is the logical NOT operator. It negates a Boolean operand, returning true when the operand is falsy and false when it is truthy.

Syntax & Example​

let done = false;
if not done {
    print("still working");
}

let isEmpty = not items.any();

Use Cases​

  • Inverting a Boolean condition.
  • Expressing negative guards readably (if not valid).
  • Combining with and/or to build compound expressions.