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GraemeBrownGraemeBrown
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Update map_filter.rst
Provided an explanation of what map() is actually doing.
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‎map_filter.rst‎

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@@ -80,8 +80,9 @@ Reduce
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^^^^^^^^^
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``Reduce`` is a really useful function for performing some computation on
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a list and returning the result. For example, if you wanted to compute
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the product of a list of integers.
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a list and returning the result. It applies a rolling computation to sequential
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pairs of values in a list. For example, if you wanted to compute the product
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of a list of integers.
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So the normal way you might go about doing this task in python is using
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a basic for loop:

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