TypeScript enum 反向映射 / 雙向映射 All In One

TypeScript enum 枚舉實現原理

TypeScript enum

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

demo

https://www.typescriptlang.org/play

enum Direction {
  Up = 'UP',
  Down = 3,
  Left = 5,
  Right = 7,
}
// key & index

"use strict";
var Direction;
(function (Direction) {
    Direction["Up"] = "UP";
    Direction[Direction["Down"] = 3] = "Down";
    Direction[Direction["Left"] = 5] = "Left";
    Direction[Direction["Right"] = 7] = "Right";
})(Direction || (Direction = {}));
// key & index

推薦全部使用 key & index 一一雙向映射， 防止出現 index 可能不存在問題；

https://www.typescriptlang.org/play?ssl=7&ssc=15&pln=1&pc=1#code/KYOwrgtgBAIglgJ2AYwC5wPYigbwFBRQCqADlALxQDkRAClQDQGwYDu2lAzE4QDLAAzVBSgBWHlABKcAOYALYZQDsTAL54A9BqgBrYAE8oAMihwQAE2AAPIA

refs

https://www.cnblogs.com/xgqfrms/p/13881723.html

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