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Assignment Operators

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Assignment Operators

``='' is the ordinary assignment operator.

Assignment operators work as in C. That is,

    $a += 2;

is equivalent to

    $a = $a + 2;

although without duplicating any side effects that dereferencing the lvalue might trigger, such as from tie(). Other assignment operators work similarly. The following are recognized:

    **=    +=    *=    &=    <<=    &&=
           -=    /=    |=    >>=    ||=
           .=    %=    ^=

Note that while these are grouped by family, they all have the precedence of assignment.

Unlike in C, the assignment operator produces a valid lvalue. Modifying an assignment is equivalent to doing the assignment and then modifying the variable that was assigned to. This is useful for modifying a copy of something, like this:

    ($tmp = $global) =~ tr [A-Z] [a-z];


    ($a += 2) *= 3;

is equivalent to

    $a += 2;
    $a *= 3;

Source: Perl operators and precedence
Copyright: Larry Wall, et al.
Next: Comma Operator

Previous: Conditional Operator

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