在 JavaScript 中将一个 Enum 转换为另一个

Question

EDIT

As comment suggests, Enum is not part of JavaScript but part of TypeScript. I intentionally left original title as one may make mistake like me.

---

I have two enums with the same keys but different values.

enum RowStates {
    editing = 0,
    sentToApproval,
    approved
    // ...
}

enum RowColors {
    editing = '#ffffff',
    sentToApproval = '#ffffcc',
    approved = '#ccffb3'
    // ...
}

And I have some function to do convertion:

function Convert (rowState) {
// What should be here to return rowColor?
// Using switch (rowState) is obvious, but may be other solution exist?
}

Answer 1

TypeScript enums allow you to do a reverse mapping :

enum RowStates {
    editing = 0,
    sentToApproval,
    approved
}

enum RowColors {
    editing = '#ffffff',
    sentToApproval = '#ffffcc',
    approved = '#ccffb3'
}

function convert(rowState: RowStates) {
    return RowColors[RowStates[rowState] as keyof typeof RowColors];
}

console.log(convert(RowStates.sentToApproval)); // prints '#ffffcc'

Answer 2

try

function Convert (rowState: RowStates): RowColors {
    return RowColors[RowStates[rowState]];
}

working example here