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??= -- augmented assignment for ??

Description

In most cases, x ??= y is equivalent to x = x ?? y, unless a method is installed for the class of x.

See also

For the programmer

The object ??= is a keyword.

This operator may be used as a binary operator in an expression like x??=y. The user may install a method for handling such expressions with code such as

         X ??= (x,y) -> ...

where X is the class of x.

The source of this document is in Macaulay2Doc/operators/augmented_assignment.m2:39:0.