Typescript enum valueof. If you just need a type guard for a specific enum Apr 27, 2018 · 14. 1+: As mentioned, this can be achieved by using Template Literal Types like so: type WeekdayType = `${Weekday}`; TypeScript 3. Improve this answer. APPROVED_BY_FREELANCER]; In other words, the following should work: enum Initialized {. If you need to check if a value exists in an enum, click on the following article. A = 'A', Apr 11, 2016 · I may be wrong, but I believe this works due to the -operator implicitly using valueOf on each of it's operands. TypeScript supports numeric enums and string enums. } one can do a lookup like. values(strEnum) as string[]; return (value: string): value is E => enumValues. I've tried looking in the outputted bundle and it does appear that the enum is being compiled into the bundle. This way you keep your types strong, while letting your strings be strings. Syntax: Following is the syntax that we could use to initialize an enum in TypeScript-. Enums are useful when setting properties or values that can only be a certain number of possible values. From the release notes for TypeScript 2. e. String Enums in TypeScript When all members of an enum have string values, it is a string enum. Workaround: Getting a reverse mapping for string enum members. type Filtros = "Ligacoes" | "Tempo" | "Email" | "Reuniao"; const filters: Record Sep 11, 2020 · Problem 2: Typescript enums can’t be extended. I tried something like this: enum LanguageSuffix { DE = Capitalize<Language> } Jul 11, 2018 · For string enum, if the strict flag is on, we will get type string can't be used to index type 'typeof Suit'. An entry is a tuple, which is represented as an array as well. So you can apply this utility type to your enum to get a union of its values: enum Stage { STARTED = 1, COMPLETED } const SystemState = { Stage, } type ValueOf<T> = T [keyof T]; type StageType = ValueOf<typeof SystemState ['Stage']>; . new Date(). typescript; enums; Jun 8, 2022 · TypeScript enum: TypeScript enums allow us to define or declare a set of named constants i. STRING_ONE) console. Yes; // Works at runtime const nameOfYes = Response[yes]; // Also works at runtime because a reverse mapping is also generated during transpilation Feb 5, 2015 · Java provides a valueOf () method for every Enum<T> object, so given an enum like. So, the explanation of the objects above is applicable here too. [ ETypeId. We can start by creating a User-Defined Type Guard which would look like this: function isInstance<T extends object>(value: string, type: T): type is T {. Example: ` enum StringEnum { First = 'First Value', Second = 'Second Sep 25, 2023 · The Object. SUCCESS; } The result of testCalculate () and the value of the paragraph will be either 0, -1, -2 depending on the outcome. Let's use an example enum that represents actions a content blocker can take. The type of generic functions is just like those of non-generic functions, with the type parameters listed first, similarly to function declarations: function identity < Type >( arg: Type ): Type {. You can provide a name and value, like a key-value pair, for your enums. Use keyof typeof to use an enum as a restricted keys type. public static <T extends Enum<T>> T valueOf(Class<T> enumType, String name) Parameters. Enum. So, they only way to test, is to test against a string or number. A = 'x', B = 'y'. Convert object values to enum-like type in TypeScript. While we haven’t discussed union types yet, all that you need to know is that with union enums, the type system is able to leverage the fact that it knows the exact set of values that exist in the enum itself. < (less than) > (greater than) or === (equals). After the Template Literal Types released, you can directly use it to get what you want: type Enum = `${DemoEnum}` // "EnumValueA" | "EnumValueB". But when I try to use an enum in my component's template, I get "Cannot read property 'xxx' of undefined in ". It is not possible. # Use an Enum as Restricted Key or Value type in TypeScript. Green, // 1. value = testResult; // The test succeeded. [Typescript] 「なぜ enum の利用が推奨されないのか?. 其实上面的做法已经很够用了,但,如果能让它实现复用岂不是更棒?于是,我决定再多写两行,用上在 typescript 中比较高级的泛型。 我们重复下解决方案: Dec 16, 2023 · type ValueOf<T> = T[keyof T]; Let's write a type that will accept a mapping and by using the ValueOf get the expected condition: type Validate<T extends Record<KEYS, readonly VALUES[]>> = ValueOf< typeof VALUES > extends ValueOf<ValueOf<T>> ? T : never; So if the condition is true, we return the mapping itself, otherwise never. keys() and Object. Jan 12, 2021 · Say, I have a enum like this: export enum Lang { eng = '🇬🇧', rus = '🇷🇺', jap = '🇯🇵', chi = '🇨🇳', } I have a function that accepts a key of that enum and returns its value: function langToFlag(key) { return Lang[key]; } Question: How do I type the argument and the return value of this function? May 8, 2023 · Then we have another enum to check the suffix we need to get the requested language: export enum LanguageSuffix { DE = 'De', IT = 'It', FR = 'Fr', EN = 'En', } I don't like having two enums for this - it's the same but capitalized. ビジュアルスタジオコードに移動し、typescript-types という名前のフォルダーを作成するか、任意の名前を使用します。フォルダの下に value-types-using-valueof. enumType − This is the Class object of the enum type from which to return a constant. log(StringEnum. The problem here is that the string enum is not initialized. valueOf() 1584233296463 Typescript enums are a little annoying because they have two sides - the atom used to name a value, and the actual value. Sep 10, 2016 · Because of confusion with string enums and their blurry nature and issues with ordinal accessing, I prefer to rather use numerical enums and pretend them to be string ones: enum StringEnum { STRING_ONE = 0, STRING_TWO } console. } let x:string = eURL[eURL. answered Jul 5, 2021 at 15:19. type IMyReactComponentState = InputValues & {. public enum Day {. Password; // type and value (so the Fields. function useTypesEnum(type) {. includes to check if a string exists in an E [] array. typeof MyEnum will create an interface that represents the MyEnum object behind the scene and keyof will return a union of string literals, each one is the key in the MyEnum object (in other words, keyof will return a list of key s of a given object/class). In TypeScript, enums are used as types at compile-time to achieve type-safety for the constants but they are treated as objects at runtime. a collection of related values which could either be in the form of a string or number or any other data type. return new _class(); } This will effectively take an argument of type typeof T, and return a value of type T, in case of classes with a parameterless constructor signature. Jun 11, 2015 · 11 Answers. However, if I use string enums as in the example below, then how can I get the string value "Help Me" from the enum? enum myEnum {. Haskell typeclass metaprogramming). Mar 13, 2019 · An enum can hold string and number values. For constant enums, the enum must be the first member and it has no initializer. Blue // 2 } let colorName: string = Colors [2]; // "Blue". enum enum_name {. Oct 27, 2021 · Enum member values can either be constant or computed, as we have earlier discussed. enumは、予め定義した一連の定数を管理し、コードの可読性を向上させる強力な機能です。. Each of these constant values is known as a member of the enum. log(type) } Object. Sep 5, 2020 · 0. log(StringEnum[StringEnum. console. So the enum becomes like this: Apr 18, 2019 · The string of an enum can be obtained as below: enum eURL {. The if block is only run if the condition is met. If you don't want that behavior, it's easy enough to use the pre-string-enum workarounds to create similar union types. Jun 28, 2019 · Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand testResult = testCalculate() // Update the web page. g. 2 Specifying enum member values (advanced) TypeScript distinguishes three kinds of enum members, by how they are initialized: A literal enum member: either has no initializer; or is initialized via a number literal or a string literal. log(`${key} has index ${index}`) }) Jul 1, 2019 · By the way, the enum also acts as a namespace with exported types for each enum member: const z: Fields. 4. The Playground lets you write TypeScript or JavaScript online in a safe and Dec 23, 2023 · TypeScriptのvalueOfメソッドの使い方をこれから学びたいと考えているあなたへ。この記事では、初心者でも簡単に理解できる15の実例を通じて、valueOfメソッドの基本的な使い方から応用テクニックまでを徹底解説します。読めばプログラミングスキルが一段とアップすること間違いなし! Sep 7, 2016 · With non-abstract classes, it is possible to get the instance type from a class type with the following function signature: function createInstance<T>(_class: new () => T): T {. To make this Description. keys(myEnum). TypeScriptのenum (列挙型)を効果的に活用したいですか?. To get the key of an enum member by its value, you have to iterate through the enum keys and compare the associated value with your target value. Nov 23, 2022 · Thanks. A TypeScript enum not only contains the keys you define but also the numerical inverse, so for example: Mammals. TypeScript brings static analysis. FOO = 'foo', BAR = 'bar', } type FooValues =`${FooKeys}`; // this equals 'foo' | 'bar'. how to map enum values to type in typescript. This is probably not going to help you in what's the current issue (your setup seems fine), and I'm not familiar enough with lazy loading to be able to tell, but you are using 1, 2, 3 as enum values (which could be omitted), and export const enum will not create an object and try to reference that, but actually put the values where you would use them. Thus the types accessible under Fields are similar to the namespace: Feb 26, 2024 · To get all enum values as an array, pass the enum to the Object. Enums in TypeScript are real objects and exist at runtime. Now I want to map this to a string so that the paragraph shows 'Success', 'Fail' or 'ID As per the documentation, enums can be reverse-mapped as follows: enum Enum {. Thus, there is no way to access the label of an enum. return Test[num - 1]; Nov 20, 2022 · The answer to the question as asked is to query the keys (via the keyof type operator of the object named Layers. return Object. It seems everything is working, but for some reason enums aren't. 9, enums are string/number based by default, which means it should serialize the way you want it. keys and e [dynamicKey]. It's a special kind of variable, that works on types rather than values. Dec 18, 2020 · Restricting to values of object. RED: Symbol("red"), BLUE: Symbol("blue"), GREEN: Symbol("green") }; Object. May 8, 2019 · enum NumEnum { A, B, C, } // The type is inferred as NumEnum[] let numEnumValues = getEnumValues(NumEnum); TypeScript Playground. If you have a numeric enum, use the following code sample instead. valueOf () base implementation is deliberately useless: by returning an object, its return value will never be used by any primitive conversion algorithm. Keyof Type Operator - Using the keyof operator to create new types. 3. alreadyExisting: boolean. Jan 25, 2024 · TypeScript — Get All Values of an Enum. TypeScript Enums are a feature carrying a named set of constants. 1. keys (Color). The value of the Small key is 0, Medium = 1 and Large = 2. In TypeScript, enums, or enumerated types, are data structures of constant length that hold a set of constant values. entries: The keyof operator takes an object type and produces a string or numeric literal union of its keys. Previous Next . 4 now allows enum members to contain string initializers. includes(value) } Mar 7, 2016 · The Typescript enum seems a natural match with Angular2's ngSwitch directive. The example shows a numeric enum , for which we haven't specified an initial value. IOS = 'iOS', ANDROID = 'Android', 위 코드는 아래와 같은 JavaScript 코드로 트랜스파일 Oct 27, 2020 · As we know, in typescript an enum is like a plain old javascript object(at-least what the playground js-output is showing or the log showing): one way is using a function which generates a new object with {value:value} structure like below: May 30, 2018 · 1 Answer. A; let nameOfA = Enum[a]; // "A". Agree with Sergi Dote Teixidor's answer that Map is the best option for such problem. One of the simplest ways to extract a string value from an enum is to use the enum itself as a function. Since valueOf on Date returns a number the operation works. One way to achieve what you want is to use an object to emulate one. key, value. const keysAndValues = Object. If we set the type of the string to one of the possible types of the enum, we would Oct 24, 2023 · Using Enum As A Function. This tutorial shows you how to retrieve all available values of a TypeScript enum. ts という名前のファイルを作成し 4 Answers. Feb 26, 2024 · Use one of the comparison operators to compare the value against another, e. Lets start with numeric. The first challenge we're up against is working with an object instead of a type. // } This shows the correct values as a suggestion in VSCode. First, we append the type variable <T> to the type. Jan 5, 2022 · TypeScript enums are accessible though there number index on runtime, so. freeze(Colors); The const keeps Colors from being reassigned, and freezing it prevents mutating the keys and values. What you could do is maybe something like this: function MyEnum(enumVal) { this. status === DeclarationStatus[DeclarationStatus. When you create a custom object, you can override valueOf () to call a custom method Nov 24, 2023 · TypeScript. Your code uses dynamic programming with Object. Types and values reside in different namespaces, so there's no "connection" between them in the language. Red, // 0. prototype. Will return index 1 from the Test enum. This is useful when the value is not important. For dynamic codes, the type any is convenient. Follow. The Object. When I install the library into my React App, I find Cannot read properties of undefined in the browser console for the enum. Jul 26, 2023 · Inbuilt object methods. Feb 5, 2019 · The other change is that enum types themselves effectively become a union of each enum member. values return an array with same values (regardless the type). The simplest way is to make the keys match the value. Typescript has a method for going from values to types ( typeof, keyof) but no mechanism for going from types to values (e. Do note that only numeric enum values get this Reverse mapping. Homogeneity of member values determines whether the enum is a string enum or a numerical enum. May 21, 2023 · enum Types in TypeScript Enum members are typically used to store constants. You could always use string enums too, especially if you're going to always want to use the string value, and you're going to explicitly assign a value to each enum. You can just use RecordStatus. Oct 5, 2020 · Problem 2: Typescript enums can’t be extended. If you work with numeric enums, use the following code sample instead. For strings: you can create a string union from enum values using a template string. Now, if you try to merge them -- for example with Object#assign -- you'd end up with two keys having the same numerical value: const AnimalTypes = Object. Convert array of strings into Mar 21, 2018 · According to this GitHub comment, this can be achieved the following way: Maybe you can try this function, it can return all values in string + number enum type, not only string Enum. projects]; //x= 'projects'. It would be nice if TypeScript generated something like this In this section, we’ll explore the type of the functions themselves and how to create generic interfaces. Password on the left is the name of a type, while the Fields. It's similar to java's enum and very intuitive to use. alpha, "Alpha" ], Apr 8, 2022 · The library is written using Typescript. assign({}, Mammals, Reptiles); Dec 15, 2023 · 1 Answer. May 7, 2019 · 1. includes(value); The as string [] type assertion is necessary so TypeScript won't complain about using Array. So before we can do anything, we need to extract a type out of that object. To enumerate the values and keys of the enum, it can effectively be treated as a standard JS object. Jan 3, 2020 · TypeScriptのEnum(列挙型)にはvalueOf(文字列から対応するenum要素を取得する)メソッドが用意されていないため、実装を追加する方法を調査した。 なお、Enumには任意のメソッドを追加できないため、namespaceを利用して実装している。 Jan 10, 2017 · If we do not cast enum to <any> type then TypeScript will show the error: Element implicitly has 'any' type because index expression is not of type 'number'. Reading time · 2 min. forEach( type => { executeType(type); } ) This outputs the enum values like TEST_ONE and BETA. const SHAPES = { SQUARE: 'square', CIRCLE: 'circle', }; type Shape = typeof SHAPES; Shape now equals: Jun 14, 2021 · Introduction. Also, their values can be computed or calculated at compile time. SaveValue( new MyEnum(TestEnum. Jun 21, 2023 · const [key, value] = entry; // use array destructuring to get the key and value. Actually, Object. As long as your enums are not defined as const you can make a very similar comparison as your old method. The TypeScript documentation contains more details on constant versus computed enums, if you’re interested. We'll get a kebab-case value from our API but want to use a camelCase value in TS: Mar 28, 2017 · Since TestEnum isn't even a function, you can't create an instance of it, so this isn't going to work. Declaration. // type LayerKeys = "Front" | "Middle" | "Back". Some code philosophers argue this goes against the ethos of enums, which are meant to be static lists and nothing more. } const types: Map<ETypeId, string> = new Map( [. enum Colors {. When you declare an enum like. values() methods. # Additional Resources. mass / (this. Generics - Types which take parameters. STRING_ONE]) this will give you May 22, 2018 · From a similar issue on github: "The intent of string enums is that the values of the enum are opaque (i. function getEnumKeyByEnumValue(myEnum, enumValue) {. Playground link to code. values(type). It means that by default the TypeScript Enum type works with number indexes, i. val = enumVal; } a. }; In this section we’ll cover ways to express a new type in terms of an existing type or value. Dec 18, 2020 · Now the generic part: type Values = Shape[keyof Shape]; type ValueOf<T> = T [keyof T]; I've added a bit of whitespace so it's clear what happens. Use square brackets to access the array at the specific index and get the value. This method is particularly useful for numeric enums. The constructed type will contain all of the enum keys with their values being initialized to any. G * this. For numbers: we can either create string union the same way or: starting TS 5. Extra note: Always turn on the Strict TypeScript Enums. return TEST_ERROR. It is nicely readable, gives developers a clue about which value represents what and the enum values can be used in runtime. filter (k => isNaN (Number (k))); to get my enum keys list. forEach((keyOrValue: any) => {. index. return arg; } Feb 26, 2024 · To convert a string to an enum: Use keyof typeof to cast the string to the type of the enum. Using keyof typeof allows us to get a type that represents all Enum keys as strings. Feb 13, 2018 · So Object. [key in InputIDs]: string. 4+: Following up on @jcalz answer and the comment from @just-boris, here's an example with const assertions: 通用的valueof. keys and Object. valueOf() method. they can be changed behind the scenes without breaking consumers). keys(Type). return 'Your animal is a ' + param; } The goal is for me to be able to export this function elsewhere in my code, and get the intellisense to say that param can be 'cat'|'dog'|'fish'. filter(x => myEnum[x] == enumValue); 12. How would I go about printing testing. 아래 TypeScript 예시 코드를 보겠습니다. Sorted by: 42. bye; alert({myEnumVal: blah}); // object {myEnumVal:1} Enums. The valueOf () method can be used to convert a string object into a string. typescript. Let's say something like this: executeType(type: string) { console. This is because, they are converted to plain objects once the TypeScript code is compiled to JavaScript. That object has a type which can be acquired via the typeof type operator: type LayerKeys = keyof typeof Layers. lang. You can only go from enum to type. I've posted more details here: How to get an array of enum values in TypeScript Here's a nifty utility I use: /** * A common method for all enums since they can't have another base class * @param <T> Enum type * @param c enum type. Jun 8, 2020 · This how the enum is transpiled to javascript ( Typescript playground) Precision[Precision["ONE"] = 1] = "ONE"; Precision[Precision["TWO"] = 2] = "TWO"; This makes it easy for you to convert the string value to number and numeric value to string using the bracket notation. values (Color) could return a key if the value is a number and your enum is a string. Sep 19, 2018 · TypeScript 4. Nov 29, 2022 · keyof will get the keys of the enum, I don't think there is a valueof operator. Feb 26, 2024 · To access an enum by index: Use the Object. Following is the declaration for java. let c = Color[0], but not with string indexes like let c = Color["string"]. Members can have string constants, numerical constants or mix of both. In my experience, however, enums don’t live in isolation from changes Jul 20, 2021 · 2 Answers. If I do not need the values of TYPES in runtime, I even prefer to use the TYPES as a @typedef: /**. TS enum MyEnum { hello, bye } var blah:MyEnum = MyEnum. Enums have a runtime reification and are not just a type the way a union is. Password = Fields. radius); public surfaceWeight(otherMass: number) {. 0. 」をまとめてみた の記事でTypescriptでは、enumを利用したいシーンでは「Union typeを利用しよう」と紹介させていただきました。. enum typescript return specific value. Sep 27, 2021 · 初めに. alpha = "a", beta = "b". Dec 30, 2022 · How to convert Enum in TypeScript to array which returns keyof typeof Enum? 0. This is not possible as asked. Jul 7, 2019 · Enum 是在 TypeScript 中增加的新語法,也被稱做「列舉」或「枚舉」,實務面會用它來管理多個 同系列 的常數(不可修改的變數),做為狀態的判斷所 The name must match exactly an identifier used to declare an enum constant in this type. ts. Type ValueOf maps each key of the enum to its value, and then unions those types together. It is by design that you cannot assign a string to a property who's type is an enum. TypeScript 2. The value of an enum is either a string or number. You can use mapped types to produce type with enum values as a keys, then use intersection or extend it with additional properties: type InputValues = {. In line 7, the Object. Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday. By default an enum is number based, starting at zero, and each option is assigned an increment by one. values () method. testResultParagraph. The best I can come up with is: const Colors = {. projects. However, there is a better way to go by using string union types. There are two ways to achieve this. These each have a different way to check them. Enums in Python or Java are classes, which allows for custom attributes and methods directly on the enum. you are declaring a value named X (the enum object, with keys A and B) and a type named X (the union of types of the enum values, similar to "x" | "y" ). Use bracket notation to access the corresponding value of the string in the enum. This object is also named Animal, but it is not of type Animal since it contains all the entries for the enum. Note that you could just export the _names and _indices consts rather than exposing them through an exported function, but because the exported members are members of the enum it is arguably clearer to have them as functions so they are not confused with the actual enum members. Mar 5, 2019 · How to convert Enum in TypeScript to array which returns keyof typeof Enum? 0. } let a = Enum. Jan 15, 2024 · 2 Answers. It's not possible to ensure the parameter is an enum, because enumerations in TS don't inherit from a common ancestor or interface. let keys = Object. Some code philosophers argue this goes Feb 26, 2014 · In version >= 0. A constant enum member is initialized via an expression whose result can be computed at compile time. You must refer to the enum in order to assign one of its values. 当記事では、TypeScriptのenumの基本から応用まで、実例コードを用いてわかりやすく解説しています Mar 27, 2019 · keyof typeof on an enum. return {. The valueOf () method returns the primitive value of a string. Last updated: Feb 26, 2024. } Then. Feb 11, 2019 · An enum has a type for the item of an enum (Animal) but also a type for the object that holds the values at runtime. Password on the right is the name of a value). 4: String Enums. However, based on the described problem, I think that it could be simplified to Map<ETypeId, string>: enum ETypeId {. Next, we use that variable as the argument instead of our concrete type. values(enumType); const values = []; keysAndValues. Sep 4, 2020 · Sorted by: 14. function keepIfInEnum<T>(. surfaceGravity(); In java for each item in the enum a static instance is created, which means that this indeed does the same thing, it's just that java has a nicer syntax for defining enums. enum Response { No = 0, Yes = 1, } const yes = Response. You can learn more about the related topics by checking out the following tutorials: Convert an Enum to a Union Type in TypeScript; How to compare Enums in Typescript; How to convert a String to Enum in TypeScript Oct 8, 2023 · TypeScript で valueof を使用してプロパティ値タイプのユニオンを返す. A. Aug 2, 2020 · function getAnimal (param: ValueOf<Animal>) {. The former returns an array containing the keys of the objects, whereas the latter returns the values. Here, you might choose to probe it with Object. all = 'strings', const enumValues = Object. value: string, enumObject: { [key: string]: T } May 16, 2018 · In Typescript there are 2 kinds of enums: Classic enum: ; During TS to JS transpilation they are converted to real objects, so they exist at runtime. An enum is a special "class" that represents a group of constants (unchangeable variables). I use Object. For anyone who comes here looking to validate if a string is one of the values of an enum and type convert it, I wrote this function that returns the proper type and returns undefined if the string is not in the enum. entries () method will transform the enum into an array of entries. toString (). enum FooKeys {. Indexed Access Types - Using Type ['a'] syntax to access a subset of a type. return otherMass * this. Enums come in two flavors string and numeric. Many built-in objects override this method to return an appropriate primitive value. The valueOf () method does not change the original string. 4 they already have a String Enums support. Enums are a feature added to JavaScript in TypeScript which makes it easier to handle named sets of constants. one and beta. The following type P is the same type as type P = "x" | "y": If the type has a string or number index signature, keyof will return those types instead: Note that in this example, M is string | number — this is because JavaScript object keys are May 5, 2017 · Add a comment. Feb 27, 2017 · While looking at this question i found that since typescript 2. Humans === 0 && Mammals[0] === 'Humans'. values () method to get an array containing the enum's values. So we have to something like: for (const suit in Suit) { const mySuit: Suit = Suit[suit as keyof typeof Suit]; } Sep 12, 2021 · In TypeScript, enums are purely a compile-time abstraction, they compile down to their base primitives (in this case, strings) at runtime. Apr 12, 2017 · return Planet. valueOf("Monday"); If the string passed to valueOf () does not match (case sensitive) an existing Day value, an IllegalArgumentException Jun 9, 2017 · I'm rebuilding an old Java project in Javascript, and realized that there's no good way to do enums in JS. values method will return an array of the enum's values because enums in TypeScript are real objects and exist at runtime. Typeof Type Operator - Using the typeof operator to create new types. one. Maybe there is a compiler option for this is forcing this constrain and I'm not aware. Try this. 2. VALUE_1) ); Then check using isInstance = value instanceof MyEnum. The simplest way to iterate over an enum in TypeScript is using the inbuilt Object. Feb 26, 2020 · 5. For that, we use typeof. Share. その際にUnion typeとして表現する際に登場した typeof "object value" [keyof Now I want to execute a function for each enum string value. radius * this. However, typescript doesn't like it. Day day = Day. Since you want 1 to return type1, we'll need to subtract 1 from your num to get the desired index: 'type1', 'type2', 'type3', 'type4', 'type5'. How can I use enum values in my component template? Sep 10, 2020 · TypeScript에서 const enum 을 사용해 보면 enum 과 거의 같다고 느껴지지만, enum 의 내용이 트랜스파일할 때 인라인으로 확장된다는 점이 다릅니다. Submitted. ih de oy ui ey lt be ez yp sh