Booleans may seem harmless, but using them can be fraught with peril. When you can’t avoid them, follow these five rules. Booleans are deceptively simple. They look harmless—just true or false, right?

It's cleaner and less cluttered: The double-unary operator is the most concise way to apply a mathematical coercion operation to an array. For example, if you have a complex nested array formula, two ...