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The Beauty and Joy of Computing Lecture #19 Higher Order Functions II Instructor: Sean Morris Twitter Can Tell Whether Your Community Is Happy or Not www.theatlanticcities.com/neighborhoods/2013/07/how-twitter-can-predict-your-communitys-wellbeing/6270 "training," "gym," "waves," "mountains," "camping", "ideas," "suggestions," "advice," "meetings," "conferences," "support," "donate"

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (2) Garcia Review useful HOFs map Reporter over List Report a new list, every element E of List becoming Reporter(E) keep items such that Predicate from List Report a new list, keeping only elements E of List if Predicate(E) combine with Reporter over List Combine all the elements of List with Reporter(E) This is also known as reduce Acronym example keep map combine The script, run and launch For each Compose example Today

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (3) Garcia Pair this out … Composing Higher-Order Functions, report this…

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (4) Garcia What would this report: a) UCB, as before b) UoCaB c) UCaB d) UoCB e) Something else Peer Instruction

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (5) Garcia Pair this out … What does the Sprite do? a)Say :,, b)Say : Tweet 1, Tweet 1, Tweet 1 c)Say : Tweet 3, Tweet 3, Tweet 3 d)Say : Tweet 1, Tweet 2, Tweet 3

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (6) Garcia Go Deep … What makes for each a High-Order Function?

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (7) Garcia Go Deeper … Explain the difference between the Higher- Order function, map, and the Higher-Order function for each.

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (8) Garcia Higher-Order Functions so far… Consumers of functions …

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (9) Garcia Cascade: Pair this out What is reported? a)2 b)16 c)60 d)80

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (10) Garcia Cascade: Check it out

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (11) Garcia Compose: Pair this out What does the Sprite say? a)Nothing b)Build Your Own Blocks c)Build d)Your e)Own f)Blocks

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (12) Garcia Compose : Returning Functions Returns a function f(g(x))

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (13) Garcia Compose : Another Example

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (14) Garcia Compose : Try this … A screensaver? A circle starts with a radius of 1 cm and expands as a function of time – doubles its radius every second. Using compose, write the function that will calculate the circles area at any given time. What are the two functions?

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (15) Garcia Write your own : Try this …

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UC Berkeley The Beauty and Joy of Computing : Higher-Order Functions II (16) Garcia Functions as data Lambda

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