javascript - TypeScript enum to object array

Question

I have an enum defined this way:

export enum GoalProgressMeasurements {
    Percentage = 1,
    Numeric_Target = 2,
    Completed_Tasks = 3,
    Average_Milestone_Progress = 4,
    Not_Measured = 5
}

However, I'd like it to be represented as an object array/list from our API like below:

[{id: 1, name: 'Percentage'}, 
 {id: 2, name: 'Numeric Target'},
 {id: 3, name: 'Completed Tasks'},
 {id: 4, name: 'Average Milestone Progress'},
 {id: 5, name: 'Not Measured'}]

Is there are easy and native way to do this or do I have to build a function that casts the enum to both an int and a string, and build the objects into an array?

Answer 1

A tricky bit is that TypeScript will 'double' map the enum in the emitted object, so it can be accessed both by key and value.

enum MyEnum {
    Part1 = 0,
    Part2 = 1
}

will be emitted as

{
   Part1: 0,
   Part2: 1,
   0: 'Part1',
   1: 'Part2'
}

So you should filter the object first before mapping. So @Diullei 's solution has the right answer. Here is my implementation:

// Helper
const StringIsNumber = value => isNaN(Number(value)) === false;

// Turn enum into array
function ToArray(enumme) {
    return Object.keys(enumme)
        .filter(StringIsNumber)
        .map(key => enumme[key]);
}

Use it like this:

export enum GoalProgressMeasurements {
    Percentage,
    Numeric_Target,
    Completed_Tasks,
    Average_Milestone_Progress,
    Not_Measured
}

console.log(ToArray(GoalProgressMeasurements));