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# Take & Drop (MOTM 2010.04)

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Ruby Method of the Month 2010.04. Lightning talk for the Columbus Ruby Brigade.

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• ### Take & Drop (MOTM 2010.04)

1. 1. MOTM: Take & Drop Kevin Munc — @muncman
2. 2. Taking
3. 3. take & take_while take(n) gives you the first n elements take_while { |elem| block } gives you elements until the block condition is nil or false Works on Array and Enumerable
4. 4. take uhray = [0,1,2,3,4,5,6,7,8,9] uhray.take(5) => [0,1,2,3,4]
5. 5. take uhray = [0,1,2,3,4,5,6,7,8,9] uhray.take(5) => [0,1,2,3,4] uhray = [] uhray.take(5) => []
6. 6. take_while uhray = [0,1,2,3,4,5,6,7,8,9] uhray.take_while { |item| item < 6 } => [0,1,2,3,4,5]
7. 7. take_while uhray = [0,1,2,3,4,5,6,7,8,9] uhray.take_while { |item| item < 6 } => [0,1,2,3,4,5] uhray.take_while { |item| item > 6 } => []
8. 8. Dropping
9. 9. drop & drop_while drop(n) gives you all elements after the first n elements drop_while { |elem| block } gives you all elements starting when the block condition is nil or false Works on Array and Enumerable
10. 10. drop uhray = [0,1,2,3,4,5,6,7,8,9] uhray.drop(5) => [5,6,7,8,9]
11. 11. drop uhray = [0,1,2,3,4,5,6,7,8,9] uhray.drop(5) => [5,6,7,8,9] uhray = [] uhray.drop(5) => []
12. 12. drop_while uhray = [0,1,2,3,4,5,6,7,8,9] uhray.drop_while { |item| item < 6 } => [6,7,8,9]
13. 13. drop_while uhray = [0,1,2,3,4,5,6,7,8,9] uhray.drop_while { |item| item < 6 } => [6,7,8,9] uhray.drop_while { |item| item > 6 } => [0,1,2,3,4,5,6,7,8,9]
14. 14. Questions? Built on an iPad Photo Credits http://www.ﬂickr.com/photos/stevewall/802936876/ http://www.ﬂickr.com/photos/z6p6tist6/3967592710/ http://www.ﬂickr.com/photos/whosdadog/3652663745/