typescript 1个回答 0投票 枚举还有各种其他功能,例如 类型约束 可以用函数初始化 枚举E { A = getA(), B = 获取 B() } 还有其他各种 https://www.typescriptlang.org/docs/handbook/enums.html最新问题 如何在Android Kotlin中每5秒致电API? Sci-kit学习:研究错误分类的数据
typescript enums 1个回答 1投票 不,您不能将枚举名称转换为字符串,因为类型信息仅在编译期间存储。您必须传递额外的参数,指定您使用的枚举。 但您可以使用方括号将枚举值转换为字符串并返回: Fiddle enum YesNo { No = 0, Yes = 1, } console.log(YesNo[YesNo.Yes]); console.log(YesNo[YesNo....
We use dotnet-config for parsing the files (written in TOML), so it's possible to inherit from parent directories, a user-wide configuration or a system-wide configuration. Or have a repository-specific configuration that can be overridden inside the repo with typecontractor.config.user. You ...
One problem with symbols is that we need to convert them to strings explicitly, we can’t coerce them (e.g. via + or inside template literals):assert.throws( () => console.log('Color: '+Color.red), /^TypeError: Cannot convert a Symbol value to a string$/ ); And while we can ...
In C programming, an enumeration type (also called enum) is a data type that consists of integral constants. To define enums, the enum keyword is used. enum flag {const1, const2, ..., constN}; By default, const1 is 0, const2 is 1 and so on. You can change default values of...
One problem with symbols is that you need to convert them to strings explicitly, you can’t coerce them (e.g. via+or inside template literals): console.log('Color: '+Color.RED)// TypeError: Cannot convert a Symbol value to a string ...
// EntityB.ts import { SomeEnum } from './EntityA' console.log(SomeEnum); // PROBLEM! SomeEnum is undefined export class EntityB { @Column({ type: 'enum', enum: SomeEnum }) enumColumn: SomeEnum; } One of the solutions to move your enum into separate file. Maybe this will help...
We then declared a variable pizzaSize of the Size type. Here, the variable pizzaSize can only be assigned with 4 values (SMALL, MEDIUM, LARGE, EXTRALARGE). Notice the statement, Test t1 = new Test(Size.MEDIUM); It will call the Test() constructor inside the Test class. Now, the ...
We can convert our Enum to a reader-friendly string by writing the string inside the Description attribute of the Enum. The following code example shows us how to convert an Enum value to a string with the Description attribute in C#. using System; using System.Collections.Generic; using ...
In the example, we create an enum inside theSwitchEnumclass and name itDays. It holds seven constants that are the days of a week. We use the switch and case method to show a different message for each day. We get the value from the enum using the constant’s name likeDays.MONDAYwil...