Learning TypeScript 2.x - Second Edition

The single-selection structure (if)

The following code snippet declares a variable of type boolean and name isValid. Then, an if statement will check whether the value of isValid is equal to true. If the statement turns out to be true, the Is valid! message will be displayed on the screen:

let isValid: boolean = true; 
 
if (isValid) { 
  console.log("is valid!"); 
}