Feature request: make "in" operator supporting subsets

[sergatgh]

Hello @jwadhams ,

I've got some difficulties trying to implement subset expression.

Currently it's possible to check whether a string is a part of another string

Example from site: {"in":["Spring", "Springfield"]}

I'd like to see a logic that will also work for expression {"in":[ [1, 2], [0, 1, 2, 3]]} - in this case I would expect to have "true" value in the result.

If that looks confusing, then it might be a good idea to have a new operator for this?

May I also ask you to help me to compose subset logic with existing operators?
Currently I'm using a logic like this:

{ "and": [ "in":[ 1, [0, 1, 2, 3]], "in":[ 2, [0, 1, 2, 3]] ] }

Is there a better way of writing this expression?

[jwadhams]

Could you rewrite it to use all?

{"all":[
    [1,2],
    {"in":[{"var":""}, [0,1,2,3]]}
]}

Otherwise you could add an operation:

jsonLogic.add_operation('containsAll', function(needles, haystack){
    return needles
        .map((needle) => haystack.indexOf(needle) !== -1) 
        .reduce((includes, carry) => {return carry && includes;}, true);
})

jsonLogic.apply({"containsAll":[[1,2],[0,1,2,3]]}) // true

[sergatgh]

Hello @jwadhams
Thanks for your reply.

Yes I tried that way using "all", but in my case collection [0,1,2,3] was supposed to be given from state object like this:

{"all":[
    [1,2],
    {"in":[{"var":""}, {"var":"collection"}]}
]}
// (note: the example doesn't work, because context object changes in operations "some", "all" and "none")

Thanks for the provided example, that's what our team is going to use.