half-finished translation of tune's slides "Lens で Haskell をもっと格好良く！" it's just only half of each header of slide yet. here is the original source: http://www.slideshare.net/itsoutoftunethismymusic/ekmett-17955009

gistfile1.md

Title

A gentle introduction to write an attractive Haskell program with lens

Author

ちゅーん tune

Date

2013-03-31

Note

"ekmett" 勉強会 (ben-kyo-kai; meeting) at Shibuya, Tokyo Japan.

#ekmett_conf is the hash tag of twitter.

Almost Japanese tweets are gathering here.

The meeting went off very well.

Translator

IKEGAMI Daisuke [email protected]

ikeg at #haskell-lens at IRC freenode.

Please send me your comments.

Who is the author?

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Contents

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What is lens

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Introduction : useful tuples with lens

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How to get a member in a tuple

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Case of a nested tuples

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Replace a member in a tuple

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What is a problem with replacing

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Complaints without lens

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With lens!

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Getting started with lens

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Import lens

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How to get a member in a tuple

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How to replace a member in a tuple

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Conclusion of this section

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Any datatype with lens

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Example : Point and Line

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To manipulate Point without lens is simple

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To replace Point is complex

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With lens!

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Continued : Point and Line with lens

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Operators in lens

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Conclusion of this section

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Look inside lens

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Define "Setter"

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Look fmapDefault

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And traverse

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One, two, setters

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Define setters

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And more

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Next, getters

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Peep foldMapDefault

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Abstract traverse

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Define accessors

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Apply _1 and _2 to foldMapOf

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Define the operator (^.)

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Getter and Setter

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Final : definition of Lens via Functor

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Reimplement _1 and _2 with Lens

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Compose traverses

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Compose _1 and itself

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Conclusion this section

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Remark

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Advice on looking into Lens

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Introduction to functions of lens

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Read documents in Hackage

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Example : foldMapOf and over

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Example : to

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Examples: Setter and operators

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Examples : (.=) and use

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Examples : Setter and MonadState

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Example : Action

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Others in Hackage

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Bottom of lens

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What is lens

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Message from the author

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Message from an audience

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UNDEFINED MANY THINGS YET

With lens!

Thanks.