List Processing Make a Personal Weather Map with Popfly

Short Description
Many web sites, news broadcasts, and newspapers use weather maps to display temperature and forecast data on a map for selected cities. In this lesson you will learn two different techniques for building your own customized weather map, on which you can plot temperature and forecast information for cities you choose.

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Content
Overview
Many web sites, news broadcasts, and newspapers use weather maps to display temperature and forecast data on a map for selected cities. In this lesson you will learn two different techniques for processing data to build your own customized weather map, on which you can plot temperature and forecast information for cities you choose. Creating a personalized weather map requires gathering weather data for each of the cities to be plotted, and then “mashing” that data with a map.
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Processing Lists
The Weather Map mashup will gather temperature values for several different cities, and store them in a list (sometimes also called an array). A list or array describes a collection of items all of which contain the same type of information. It is common to process each item of a list in the same way: imagine adding up a list of test scores, finding the largest value of all the stocks in your portfolio, accessing one volume from a set of encyclopedias, or printing a form letter customized for each person in your address book. The processing is the same for each item. The only thing that is different is the specific information in each item. Popfly is smart enough to know that if a block receives an array of items as an input, the block will process all of the items in that array in the same way.
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