From: Simon Mullis <simon@...>
Date: 2007-10-12T19:54:13+09:00
Subject: Array +=

Hi All,

Question re Array method += and

>> a = []
=> []
>> a += [1, 2, 3, 4]
=> [1, 2, 3, 4]

And

>> (a ||= []) << [1, 2, 3, 4]
=> [[1, 2, 3, 4]]

But

>> ( a ||= [] ) += [ 1, 2, 3, 4 ]
SyntaxError: compile error
(irb):28: syntax error, unexpected tOP_ASGN, expecting $end
( a ||= [] ) += [ 1, 2, 3, 4 ]
               ^
        from (irb):28

Why?

I guess it's a precedence issue. '<<' is a method in the Array class.
'+=' is not.

Is there alternate syntax I should use?

Thanks

SM