Unary & Double Bang !! Casting

    // double-bang.js
    // Casting to Boolean with the !!
    // Casting to Number with unary +
    // unary binary ternary
    
    log = console.log;
    let num = 12;
    
    // if ( ! num ) ;
    
    let bool = !!num; 	// flips from number, to falsey, to true
    let str = "14";
    let fourteen = +str; 	// converts from string into an actual number