by Alexey Samoshkin

JavaScript type coercion explained
Know your engines
Weird things can happen in JavaScript[Edit 2/5/2018]: This post is now available in Russian
[https://medium.com/@sergeybulavyk/%D0%BF%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D0%B5-%D1%82%D0%B8%D0%BF%D0%BE%D0%B2-%D0%B2-javascript-35a15ddfc333]
. Claps to Serj Bulavyk [undefined]  for his efforts.

Type coercion  is the process of converting value from one type to another (such
as string to nu

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struct string {};

struct number {
 operator string() { return {}; }
};

number operator+(number, number) { return {}; }
string operator+(string, string) { return {}; }



int main() {
 auto ss = string{} + string{};
 auto nn = number{} + number{};
 
 auto sn = string{} + number{};
 
 static_assert(__is_same(decltype(ss), string));
 static_assert(__is_same(decltype(nn), number));
 
 
 static_assert(__is_same(decltype(sn), string));
 
}