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Update README.md

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Jack Firth 2015-08-28 10:16:16 -07:00
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@ -12,6 +12,8 @@ A lens is a value that can be used to focus on a small subpiece of some larger s
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> (lens-set first-lens '(1 2 3) 'a)
'(a 2 3)
> (lens-transform first-lens '(1 2 3) number->string)
'("1" 2 3)
> (define first-of-b-key-lens (lens-compose first-lens (hash-ref-lens 'b)))
> (define a-hash (hash 'a '(1 2 3) 'b '(10 20 30) 'c '(100 200 300)))
> (lens-view first-of-b-key-lens a-hash)