Enum flags in JavaScript

Yes, bitwise arithmetic works in Javascript. You have to be careful with it because Javascript only has the Number data type, which is implemented as a floating-point type. But, values are converted to signed 32-bit values for bitwise operations. So as long as you don't try to use more than 31 bits, you'll be fine.

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?

In javascript you should be able to combine them as:

var left_right = MyEnum.Left | MyEnum.Right;

Then testing would be exactly as it is in your example of

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