Errata: Bitwise vs Logical OR, Ch 9

📚 Official Books 2D iOS & tvOS Games by Tutorials
1

I think you mean “Bitwise OR” on page 221 instead of “Logical OR”:

This is very handy and allows you to easily combine categories. For example, when
you want to specify that the cat should collide with all block bodies and the bed,
you can say the collision bit mask for the cat is PhysicsCategory.Block |
PhysicsCategory.Bed (read this as “block OR bed”), which produces the logical OR of
the two values:
• PhysicsCategory.Block | PhysicsCategory.Bed: Decimal 6, Binary
00000110