What is the best way to utilize enum values as indices for an array?

Question

What is the best way to utilize enum values as indices for an array?

I'm encountering an issue when attempting to utilize an enum value as an index for an array.

export class Color {
    static RED = 0;
    static BLUE = 1;
    static GREEN = 2;
}

let x = ['warning', 'info', 'success'];
let anotherVariable = x[Color.RED]; <---- Error: Type 'Color' cannot be used as an index type.

I've attempted using Number() and parseInt to convert the enum value to a number, but it hasn't resolved the error.

Is there a workaround that would enable me to use Enum values as valid indexes?

javascript arrays enums array-indexing

Answer 1

Answer №1

When creating an Enum, we define a const frozen object. To understand the distinction between the two and why they are used differently, consider the following explanation:

Using 'const' is applicable to bindings (or "variables"). It establishes an immutable binding, meaning you cannot assign a new value to it.

On the other hand, Object.freeze operates on values, specifically object values. It renders an object immutable, preventing any changes to its properties.

Source:

Even after implementation, we can retrieve keys and values similar to how we interact with a regular object.

// Refer to: https://stackoverflow.com/questions/287903/what-is-the-preferred-syntax-for-defining-enums-in-javascript
const COLORS = Object.freeze({"RED":0, "BLUE":1, "GREEN":2})

let x = ['warning', 'info', 'success'];
let anotherVariable = x[COLORS.RED]; 

console.log(anotherVariable)

Additionally, explore:

Answer 2

When creating an Enum, we define a const frozen object. To understand the distinction between the two and why they are used differently, consider the following explanation:

Using 'const' is applicable to bindings (or "variables"). It establishes an immutable binding, meaning you cannot assign a new value to it.

On the other hand, Object.freeze operates on values, specifically object values. It renders an object immutable, preventing any changes to its properties.

Source:

Even after implementation, we can retrieve keys and values similar to how we interact with a regular object.

// Refer to: https://stackoverflow.com/questions/287903/what-is-the-preferred-syntax-for-defining-enums-in-javascript
const COLORS = Object.freeze({"RED":0, "BLUE":1, "GREEN":2})

let x = ['warning', 'info', 'success'];
let anotherVariable = x[COLORS.RED]; 

console.log(anotherVariable)

Additionally, explore:

Answer 3

Answer №2

Give this a shot.

    const colors = {
        RED : 0,
        BLUE : 1,
        GREEN : 2
    }

    module.exports = colors

    let messages = ['error', 'warning', 'info'];
    let selectedMessage = messages[colors.BLUE];

Answer 4

Give this a shot.

    const colors = {
        RED : 0,
        BLUE : 1,
        GREEN : 2
    }

    module.exports = colors

    let messages = ['error', 'warning', 'info'];
    let selectedMessage = messages[colors.BLUE];

What is the best way to utilize enum values as indices for an array?

Answer №1

Answer №2

Similar questions

The TypeScript type '(status: string) => { text: string; onClick: () => void; }[]' cannot be matched with the type '{ text: string; onClick: () => void; }[]'

The issue of misplaced data and nested v-for loops

Find the target element containing a child element with specific CSS attribute using JQuery

Retrieve the nested value of an object using the specified key field

Iterating to generate an array containing three unique combinations from a set of three elements

JQMIGRATE: Migration installed successfully, with version 3.0.0 log and minimum version requirements met

Nuxt 3: Pinia: How does mutating my state affect the integrity of the entire array?

Integrating scripts in React Native applications

Inconsistent CSS3 transitions behavior in Firefox 4

Identifying the moment when the hide() function in jQuery is triggered for an element

Unable to retrieve this object because of a intricate JavaScript function in Vue.js

"Enhance your Vue components with a directive to customize or adjust element attributes

Cycle through an array of elements and generate a fresh object

Ways to retrieve JSON data using getRequest

I'm experiencing a problem with my scrollTo function - what could be the cause?

Easily transforming data between JSON and CSV formats in JavaScript using user-defined headers

Pattern for regex to match the following example: test test123

Ensure that only one menu with a specific class is open at any given time

Mistake in algorithm for identifying peaks

Discovering the Javascript Code Executing on a <span> element with the Help of Chrome Inspector or Firebug