Enum flags in JavaScript

Question

I need to emulate enum type in Javascript and approach seems pretty straight forward:

var MyEnum = {Left = 1; Right = 2; Top = 4; Bottom = 8} 

Now, in C# I could combine those values like this:

MyEnum left_right = MyEnum.Left | MyEnum.Right 

and then I can test if enum has certain value:

if (left_right & MyEnum.Left == MyEnum.Left) {...} 

Can I do something like that in Javascript?

Answer 1

You just have to use the bitwise operators:

var myEnum = {   left: 1,   right: 2,   top: 4,   bottom: 8 }  var myConfig = myEnum.left | myEnum.right;  if (myConfig & myEnum.right) {   // right flag is set } 

More info:

• Understanding bitwise operations in javascript
• How to check my byte flag?