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Function | Description | Output type
--- | --- | ---
##### min() | Provides the min value of an array of numbers. | Double
##### max() | Provides the max value of an array of numbers. | Double
##### avg() | Provides the average value of an array of numbers. | Double
##### stddev() | Provides the standard deviation value of an array of numbers | Double
##### length() | Provides the length of an array | Integer
##### sum() | Provides the sum value of an array of numbers. | Double
##### keys() | Provides the property keys (An alternative for terminal tilde ~) | Set
##### concat(X) | Provides a concatinated version of the path output with a new item. | like input
##### append(X) | add an item to the json path output array | like input
##### first() | Provides the first item of an array | Depends on the array
##### last() | Provides the last item of an array | Depends on the array
##### index(X) | Provides the item of an array of index: X, if the X is negative, take from backwards | Depends on the array