TypeScript枚举到对象数组 [英] TypeScript enum to object array

问题描述

我有这样定义的枚举：

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

但是，我希望它从我们的API表示为对象数组/列表，如下所示：

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'}]

是否有简单的本地方式来执行此操作，或者我是否必须构建一个将枚举转换为int和字符串的函数，以及将对象构建为数组？

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?

推荐答案

枚举是运行时存在的真实对象。所以你可以反转映射做这样的事情：

Enums are real objects that exist at runtime. So you are able to reverse the mapping doing something like this:

let value = GoalProgressMeasurements.Not_Measured;
console.log(GoalProgressMeasurements[value]);
// => Not_Measured

基于此，您可以使用以下代码：

Based on that you can use the following code:

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

let map: {id: number; name: string}[] = [];

for(var n in GoalProgressMeasurements) {
    if (typeof GoalProgressMeasurements[n] === 'number') {
        map.push({id: <any>GoalProgressMeasurements[n], name: n});
    }
}

console.log(map);

参考： https://www.typescriptlang.org/docs/handbook/enums.html

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