infix .=

Documentation for infix .= assembled from the following pages:

Language documentation: Operators Ā§

From Operators

(Operators) infix .= Ā§

Calls the right-side method on the value in the left-side container, replacing the resulting value in the left-side container.

In most cases, this behaves identically to the postfix mutator, but the precedence is lower:

my $a = -5;
say ++$a.=abs;
# OUTPUT: Ā«6ā¤Ā» 
say ++$a .= abs;
# OUTPUT: Ā«Cannot modify an immutable Intā¤
#           in block <unit> at <tmp> line 1ā¤ā¤Ā»