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Showing content from https://developer.mozilla.org/ru/docs/Web/JavaScript/Reference/Operators/Addition below:

Сложение (+) - JavaScript | MDN

Baseline Widely available

Оператор сложения (+) создаёт сумму числовых операндов или конкатенацию строк.

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"

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

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

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

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

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

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

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