How to use the JsonPath functions like min()

[Charles Shen]

hi,

I am trying to find out how the use the functions min()/max()/avg()/stddev()/length()

expressions : 

$..book..price.min()

geing below exception:

Exception in thread "main" class net.minidev.json.JSONArray
[null,null,null,null]
java.lang.NullPointerException

can you please help provide some example code? cause the examples in github page dont cover this.

[kalle stenflo]

Hi,

In current implementation the function is applied to the path fragment just before the function. In your example the min() function is applied to each price. Not as you might expect to the result array containing all prices. The feature you are looking for is not available (yet).   

Check out the function tests fore more details

https://github.com/jayway/JsonPath/tree/master/json-path/src/test/java/com/jayway/jsonpath/internal/function

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[Yavuz Gökırmak]

Hi Stenflo,

I need this feature and can contribute,

where should I start, should I create an issue and ask for comments from you?