From: Matthew Moss <matthew.moss.coder@...>
Date: 2006-03-13T12:59:02+09:00
Subject: Re: Array#inject with hash as initial, unexpected error

Okay, I feel silly now.  Thanks for the reminder on basic assignment
protocol.  =)


On 3/12/06, Trevor Squires <trevor@protocool.com> wrote:
> Hey Matthew,
>
> observe:
>
> irb(main):001:0> [] << 100
> => [100]
> irb(main):002:0> {}[:something] = 100
> => 100
>
> The << operator on an array returns the array, while the [] operator
> on a hash returns the value you assigned.
>
> And the result of the last statement in your inject block will
> replace the value for your memo on each iteration.
>
> So... just make sure the last statement in your inject block is the
> memo value you are accumulating:
>
> [1,2,3].inject({}) { |memo, val| memo[val] = val**2; memo}