How to iterate through enums with integer as value in Typescript?-CodePudding

I have an enum

export enums Actions {
All = 1,
Success = 2,
Failed = 3
}

When I iterate through it using for loop, I am getting total of 6 entries. I get to know that this is how it works in Typescript. But how can I use the enum so that I can access

enum.key

for "All, Success, Falied" and

enum.value

for 1,2,3

CodePudding user response：

What you can do in order to access the enum keys and values like you described in the OP is convert your enum to a basic object that has the properties keys and values with the corresponding data.

export enum Actions {
  All = 1,
  Success = 2,
  Failed = 3
}

export type ConvertedActions = {
  keys: string[];
  values: Actions[];
};

const result = Object.values(Actions).reduce(
  (acc, curr): ConvertedActions =>
    isNaN( curr)
      ? {...acc, keys: [...acc.keys, curr as string]}
      : {...acc, values: [...acc.values, curr as Actions]},
  <ConvertedActions>{keys: [], values: []}
);

console.log(result.keys);    // [ 'All', 'Success', 'Failed' ]
console.log(result.values);  // [ 1, 2, 3 ]

Note: Don't get confused by the extra type (ConvertedActions) I defined. However, it is needed to avoid using any a lot.

CodePudding user response：

const keys = Object.keys(Actions);
const values = Object.values(Actions);

CodePudding user response：

As per the docs of typescript, if as const keyword suffices, then we dont need to use enum.

Just interpreting, maybe in this case an implementation like illustrated can be used, with Object.keys(obj) and Object.values(obj) to get the required outputs

const Actions = {
  All: 0,
  Success: 1,
  Failure: 2
} as const

let keyArr = Object.keys(Actions);
let valArr = Object.values(Actions);

CodePudding user response：

What you can do, in this specific case, is separating All, Success, Falied and 1, 2, 3 in two different arrays.

export enums Actions {
    All = 1,
    Success = 2,
    Failed = 3
}
console.log(Object.keys(enums).filter((v) => isNaN(Number(v)))); // ["All", "Success", "Failed"] 
console.log(Object.keys(enums).filter((v) => !isNaN(Number(v)))); // ["1", "2", "3"]

You can also do it with a for..in loop:

for (const value in enums) {
  console.log(value); // 1, 2, 3, All, Success, Falied
  console.log(value.filter((v) => isNaN(Number(v)))); // All, Success, Falied
  console.log(value.filter((v) => !isNaN(Number(v)))); // 1, 2, 3
}

There are more ways to do it using forEach, for..of, etc. But from your question I think my example should do the trick.