如何在 Typescript 中检查给定的枚举是基于字符串还是数字

Question

I have two enums which are defined like this:

enum Ed {
  up,
  down,
  left,
  right,
}

//or 

enum Es {
  A = "a",
  B = "b",
  C = "c",
}

So I need a function isStringEnum which for isStringEnum(Ed) or isStringEnum(Ed.up) will return false. For isStringEnum(Es) or isStringEnum(Es.A) will return true.

Thanks

Answer 1

This should do the trick:

function isStringEnum(e: object){
  return Object.entries(e).every(e => typeof e[1] === "string")
}

console.log(isStringEnum(Ed)) // false
console.log(isStringEnum(Es)) // true

Playground