Javascript Language Support for Enums# Unlike other languages like C# or Java,Javascript Does Not Have Native Support for enums. There are several ways to implement enums in Javascript, and we’ll look at each o
I figured there must be a better way to realize enums in JavaScript while addressing these shortcomings, and this is my attempt to do that. As far as I can tell, this works like one would expect, but I'm sure there are things I haven't considered. So here's what you get withenum...
In this blog post, I present enumify, a library for implementing enums in JavaScript. The approach it takes is inspired by Java’s enums.
Note: Without Object.prototype in the prototype chain, we need to provide a toString() method. Otherwise symbols cannot be converted to string, e.g. to display them on a command line. Dr. Axel RauschmayerHomepage | Mastodon Exploring JavaScriptBook (free online) and exercises...
Xbox Live Services defines JSON objects that are used in requests to, and responses from, the service. Many JavaScript Object Notation (JSON) objects used by the service have associated enumerations that specify allowed values for fields appearing in the JavaScript Object Notation (JSON) objects....
TypeScript compiles this down to the following JavaScript:"use strict"; var Enum; (function (Enum) { Enum[Enum["A"] = 0] = "A"; })(Enum || (Enum = {})); let a = Enum.A; let nameOfA = Enum[a]; // "A" TryIn this generated code, an enum is compiled into an object ...
SelectRun. Note the value displayed in theLogwindow. What value is returned? By default,enumvalues begin with a value of 0, soPermanentis 0,Tempis 1, andApprenticeis 2. If you want the values to start with a different value, in this case 1, specify that in theenumdeclaration. Make th...
问enums子集的Jackson反序列化EN根据注释中的讨论，我决定只使用Enum#name()而不是SelectOption#getId(...
因此,在JavaScript中,它被建模为常规对象,其中MyEnum.0 == "First"和MyEnum.First == 0。因此,要枚举所有枚举名称,您需要获取属于对象并且也不是数字的所有属性: for (var prop in MyEnum) { if (MyEnum.hasOwnProperty(prop) && (isNaN(parseInt(prop))) { console...
在JavaScript 中,枚举是一个以[value]: name形式存储的对象。你可以通过Object.keys(enum)获取所有值、Object.values(enum)获取所有名称,或使用for(const [value, name] of Object.entries(enum)) { ... }一次性进行迭代。需要注意的是,当你获取枚举的值时,它们将会是字符串,而不是像你期望的那样是数字(因为...