(+)

console.log(2 + 2);
// Expected output: 4

console.log(2 + true);
// Expected output: 3

console.log("hello " + "everyone");
// Expected output: "hello everyone"

console.log(2001 + ": A Space Odyssey");
// Expected output: "2001: A Space Odyssey"

x + y

const t = Temporal.Now.instant();
"" + t; // Throws TypeError
`${t}`; // '2022-07-31T04:48:56.113918308Z'
"".concat(t); // '2022-07-31T04:48:56.113918308Z'

// Number + Number -> 
1 + 2; // 3

// Boolean + Number -> 
true + 1; // 2

// Boolean + Boolean -> 
false + false; // 0

// BigInt + BigInt -> 
1n + 2n; // 3n

// BigInt + Number -> TypeError 
1n + 2; // TypeError: Cannot mix BigInt and other types, use explicit conversions

// BigInt  non-BigInt  ,    .
1n + BigInt(2); // 3n
Number(1n) + 2; // 3

// String + String -> 
"foo" + "bar"; // "foobar"

// Number + String -> 
5 + "foo"; // "5foo"

// String + Boolean -> 
"foo" + false; // "foofalse"