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kaja47/gist:2663111

Created May 11, 2012 23:36
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lenses
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gistfile1.scala
// without lenses
val _board = chan.boards(bIdx)
val _thread = chan.boards(bIdx).threads(tIdx)
val _posts = chan.boards(bIdx).threads(tIdx).posts
Right(chan.copy(boards = chan.boards.updated(bIdx, _board.copy(threads = _board.threads.updated(tIdx, _thread.copy(posts = _posts :+ newPost.post))))))
// with lenses
Right(boardsLens.at(bIdx).mod(chan, b => threadsLens.at(tIdx).mod(b, t => t.copy(posts = t.posts :+ newPost.post))))
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