Ternary Conditional

The ternary operator evaluates a condition and returns one of two values. It is right-associative.

condition ? trueExpression : falseExpression

var status = Data.active ? "on" : "off"

Nesting

Ternary expressions can be nested for multi-way selection:

var grade = score >= 90 ? "A" : score >= 80 ? "B" : "C"

Right-associativity means the above is parsed as:

var grade = score >= 90 ? "A" : (score >= 80 ? "B" : "C")

Only the selected branch is evaluated. The other branch is not executed:

var result = count > 0 ? total / count : 0    # No division-by-zero risk