add the map pattern - 1.1.3
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@ -66,3 +66,33 @@ def extractEvens(items):
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## Add isEven function
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## Add isEven function
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def isEven(value):
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def isEven(value):
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if value % 2 == 0:
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return True
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return False
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someValues = [1,2,4,3,5,7,8,6,9]
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print extractEvens(someValues)
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## Using append method because array concatenation is very slowly for large arrays
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def extractEvens(items):
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evens = []
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for i in range(0, len(items), 1):
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if isEven(items[i]):
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evens.append(items[i]) # method invocation
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return evens
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# The map pattern
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def map(f, items):
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result = []
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for i in range(0, len(items), 1):
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transformed = f(items[i])
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result.append(transformed)
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return result
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## Using this pattern
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def increment(value):
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return value + 1
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someValues = [1, 2, 3, 4, 5, 6, 7]
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print map(increment, someValues)
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