&= operator

Format

A &= B

Set A equal to A & B. It is shorthand for A = A & B.

This is commonly used to turn off certain bitfields in a word.

usr.sight &= ~BLIND // turn off the blind bit

If A and B are lists, items in A that are not in B are removed.

If A is an /icon or /matrix datum, the datum will be changed rather than creating a new one and re-assigning it to A.

See also

• operators
• |= operator