Created
September 2, 2013 20:39
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Retrieve the first non `null` value from Graphite datapoints
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| first_value([[null,Time]|T]) -> | |
| first_value(T); | |
| first_value([[Value, Time]|T]) -> | |
| {ok, Value}; | |
| first_value(_)-> | |
| {error, no_value}. |
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