JSONata: method or function for testing JSON value datatype

Question

JSONata offers conditional expressions and predicates which can be used to select values out of JSON trees.

However, I have not been able to find a way to test the datatype of a JSON value.

For example, given the array:

    [null, true, false, 1, 2.3, "a", ["x"], {}, {"y" : "z}]

I only want to pull out the numeric values.

    [1, 2.3]

Q: In a JSONata query, how does one test the JSON datatype (null, boolean, number, string, array, object) of a value?

Answer 1

Currently there is no way to do this in JSONata. Worthy of an enhancement request though.

Answer 2

Wow, today discovered this cool JSONata. Here is my try:

http://try.jsonata.org/

 [null, true, false, 1, 2.3, "a", ["x"], {}, {"y" : "z"}]

*[$ ~> /^[0-9\.]{1,}$/m]