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#1

Thank you for the book, it is very very helpful !

In the final listing of chapter 4, I think that the functions photoArray, getPhotoUrl and randomPhotoPicker are not used anymore : getPhotoUrl doesn't seems to exist anywhere in the listing and randomPhotoPicker is redefined in the update function (in a let / in block).
I have removed these 3 functions and it still compiles witout error.