Get TypeScript enum name from instance

Question

I have the following TypeScript enum:

enum Country {
    BR = "Brazil",
    NO = "Norway"
}

Then imagine I have a method that takes a Country as an argument, like so:

someFunc = (country: Country): void => {
    console.log(country) //Will print "Brazil" if country = Country.BR
    console.log(Country[country]) //Same as above
    console.log(???) //I want to print "BR" if country = Country.BR
}

How do I solve the third console.log statement?

How do I get a hold of the enum key?

Regards

Answer 1

Under the enum constrution you get something like this

Country["BR"] = "Brazil";
Country["NO"] = "Norway";

which is a simple object.

By default you can't get the keys of your enum. But you can iterate over the keys manually and try to find that one.

enum Country {
    BR = "Brazil",
    NO = "Norway"
}

console.log(Object.keys(Country).find(key => Country[key] === country))