Map Typescript Enum

Enums in TypeScript are a powerful way to define a set of named constants. They provide a structured approach to work with a collection of related values, making your code more readable and maintainable. In this article, we will explore how to map TypeScript enums for better utilization and understanding in your projects.

To begin with, let's create a simple enum in TypeScript:

enum Direction {
  Up = 'UP',
  Down = 'DOWN',
  Left = 'LEFT',
  Right = 'RIGHT',
}

In this enum, we have defined four directions with string values. Now, let's say you want to map these enum values to their corresponding display names. To achieve this, you can create a mapping object in TypeScript.

const directionMapping = {
  [Direction.Up]: 'Go Up',
  [Direction.Down]: 'Go Down',
  [Direction.Left]: 'Go Left',
  [Direction.Right]: 'Go Right',
};

By utilizing this mapping object, you can easily retrieve the display name for a specific enum value. For example:

console.log(directionMapping[Direction.Up]); // Output: 'Go Up'

Mapping enums in TypeScript becomes extremely useful when you need to handle scenarios where you want to display user-friendly names associated with the enum values. This approach enhances the clarity of your code and makes it easier for other developers to understand its purpose.

Furthermore, you can also reverse-map the enum values based on their display names. Let's consider an example using the direction mapping we created earlier:

function getDirectionByDisplayName(displayName: string): Direction | undefined {
  return Object.keys(directionMapping).find((key) => directionMapping[key] === displayName) as Direction;
}

console.log(getDirectionByDisplayName('Go Left')); // Output: Direction.Left

By defining a reverse-mapping function, you can easily obtain the enum value for a given display name. This bidirectional mapping approach can simplify your code logic and streamline data transformations.

In addition to mapping enum values, you may encounter situations where you need to iterate over all enum values. TypeScript provides a straightforward way to achieve this using the `Object.values()` method.

const allDirections = Object.values(Direction);
console.log(allDirections); // Output: ['UP', 'DOWN', 'LEFT', 'RIGHT']

By extracting all enum values into an array, you can perform operations like iteration, filtering, or mapping on the enum values as needed.

In conclusion, mapping TypeScript enums offers an efficient way to manage and utilize enum values effectively in your projects. Whether you need to associate display names, perform reverse lookups, or iterate over enum values, leveraging mapping techniques can enhance the organization and clarity of your codebase. Experiment with different mapping strategies and adapt them to suit your specific requirements for a more robust TypeScript development experience.