산수 에피소드!!

var banana = true;
console.log(banana);
//true

console.log(!banana);
//これはfalse

console.log(!!banana);
//これはtrue

console.log(!!!!!!!!!!banana);
//これでもtrue
console.log(!!!!!!!!!!!banana);
//これでもfalse

var banana = true;
(banana == true)?console.log("boo"):console.log("hey");　
//boo
(banana !== true)?console.log("boo"):console.log("hey");　
//hey
(banana != true)?console.log("boo"):console.log("hey");　
//hey

var banana = true;
(banana !!== true)?console.log("boo"):console.log("hey");　
//Uncaught SyntaxError: Unexpected token '!'

(banana !!= true)?console.log("boo"):console.log("hey");　
//Uncaught SyntaxError: Unexpected token '!'

(banana !! true)?console.log("boo"):console.log("hey");　
//Uncaught SyntaxError: Unexpected token '!'

(banana !=== true)?console.log("boo"):console.log("hey");　
//Uncaught SyntaxError: Unexpected token '='