我在TypeScript中定义了以下enum:
enum Color{
Red, Green
}
现在在我的函数中,我以字符串的形式接收颜色。我尝试了以下代码:
var green= "Green";
var color : Color = <Color>green; // Error: can't convert string to enum
如何将该值转换为enum?
我在TypeScript中定义了以下enum:
enum Color{
Red, Green
}
现在在我的函数中,我以字符串的形式接收颜色。我尝试了以下代码:
var green= "Green";
var color : Color = <Color>green; // Error: can't convert string to enum
如何将该值转换为enum?
当前回答
enum Color{
Red, Green
}
// To String
var green: string = Color[Color.Green];
// To Enum / number
var color : Color = Color[green as keyof typeof Color]; //Works with --noImplicitAny
这个例子使用TypeScript中的——noImplicitAny
来源: https://github.com/Microsoft/TypeScript/issues/13775 issuecomment - 276381229 https://www.typescriptlang.org/docs/handbook/advanced-types.html索引类型中
其他回答
从Typescript 2.1开始,enum中的字符串键都是强类型的。Keyof typeof用于获取可用字符串键的信息(1):
enum Color{
Red, Green
}
let typedColor: Color = Color.Green;
let typedColorString: keyof typeof Color = "Green";
// Error "Black is not assignable ..." (indexing using Color["Black"] will return undefined runtime)
typedColorString = "Black";
// Error "Type 'string' is not assignable ..." (indexing works runtime)
let letColorString = "Red";
typedColorString = letColorString;
// Works fine
typedColorString = "Red";
// Works fine
const constColorString = "Red";
typedColorString = constColorString
// Works fine (thanks @SergeyT)
let letColorString = "Red";
typedColorString = letColorString as keyof typeof Color;
typedColor = Color[typedColorString];
https://www.typescriptlang.org/docs/handbook/advanced-types.html#index-types
如果您为枚举提供字符串值,则直接强制转换可以很好地工作。
enum Color {
Green = "Green",
Red = "Red"
}
const color = "Green";
const colorEnum = color as Color;
我需要知道如何循环枚举值(正在测试许多排列的几个enum),我发现这工作得很好:
export enum Environment {
Prod = "http://asdf.com",
Stage = "http://asdf1234.com",
Test = "http://asdfasdf.example.com"
}
Object.keys(Environment).forEach((environmentKeyValue) => {
const env = Environment[environmentKeyValue as keyof typeof Environment]
// env is now equivalent to Environment.Prod, Environment.Stage, or Environment.Test
}
来源:https://blog.mikeski.net/development/javascript/typescript-enums-to-from-string/
enum Color{
Red, Green
}
// To String
var green: string = Color[Color.Green];
// To Enum / number
var color : Color = Color[green as keyof typeof Color]; //Works with --noImplicitAny
这个例子使用TypeScript中的——noImplicitAny
来源: https://github.com/Microsoft/TypeScript/issues/13775 issuecomment - 276381229 https://www.typescriptlang.org/docs/handbook/advanced-types.html索引类型中
它在TypeScript 4.4.3 TS游乐场链接中为我工作。
const stringToEnumValue = <T extends Record<string, string>, K extends keyof T>(
enumObj: T,
value: string,
): T[keyof T] | undefined =>
enumObj[
Object.keys(enumObj).filter(
(k) => enumObj[k as K].toString() === value,
)[0] as keyof typeof enumObj
];
enum Color {
Red = 'red',
Green = 'green',
}
const result1 = stringToEnumValue(Color, 'yellow'); // undefined
const result2 = stringToEnumValue(Color, 'green'); // Color.Green
console.log(result1) // undefined = undefined
console.log(result2) // Color.Green = "green"