myBool = str1 != nil ? true : false
print(myBool)
let a = 10
// Note that the space after the question mark
// is required! If you don't do this, the compiler
// will think you're trying to use optional chaining.
let result = a > 5 ? true : false // true
// Ternary operator ==>
// value = condition ? valueIfTrue : valueIfFalse
condition ? expression1 : expression2