When to Use Enums in Javascript? This post will explain how to implement and use enumerations (or enum types) in Javascript.Enums are types that contain a limited number of fixed values, as opposed to types like Number or String which can have a wide range of values.This...
Why do we use the Enum Concept in JavaScript? Actually enums are used for consider fixed number of values. Let suppose we have 2 possible values then we can use a boolean data type. Consider an example that if we want to show the pop up box in the application but that is only in s...
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...
Enum.ColorType = {red:0, blue:1, green:2} document.write(Enum.ColorType.blue); 方法3: 用new 建立对像 var enumObj = new Object(); enumObj.fontSize = {small:10, medium:12, large:14} document.write(enumObj.fontSize.small); http://stackoverflow.com/questions/287903/enums-in-javasc...
枚举值被修改: 使用Object.freeze()可以防止枚举对象被修改。如果尝试修改枚举值,JavaScript会抛出错误。 枚举值比较: 由于枚举值是对象属性,因此应使用全等运算符===进行比较,而不是使用==。 枚举值遍历: 可以使用Object.keys()或for...in循环遍历枚举对象的属性。但需要注意,这可能会包括原型链上的属性,因此建议...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 public enum SeasonEnum{ SPRING,SUMMER,FALL,WINTER; } 枚举类是一种特殊的类,它一样可以有自己的成员变量、方法,可以实现一个或多个接口,也可以有自己的构造器。 Java5新增了enum 关键字(与calss、interface 关键字用法相同),用来定义枚举类。 【2】为什么...
dev, javascript, pattern (Ad, please don’t block) In this blog post, we examine a pattern for implementing enums in JavaScript that is based on classes. We’ll also take a look at Enumify, a library that helps with the enum pattern....
Create const/enum/bitmap object with key names specified in String, Array, Object or Arguments Usage npm install constjs Enum (Java style) varConstJs =require('constjs');varColors = ConstJs.enum("blue red");varmyColor = Colors.blue;console.log(myColor.isBlue());// output trueconsole....
PrintMedia is an object in JavaScript which includes both value and name as properties and that's why enum in TypeScript supports reverse mapping. So, both the following mappings are true to enums: name -> value, and value -> name. Reverse mapping is not supported for string enum ...
❗️Enum 结构的特别之处在于,它既是一种类型,也是一个值。绝大多数 TypeScript 语法都是类型语法,编译后会全部去除,但是 Enum 结构是一个值,编译后会变成 JavaScript 对象,留在代码中。 //编译前enumColor { Red,//0Green,//1Blue//2}//编译后let Color ={ ...