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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

##### 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