Add "intersects" operator to JEXL

[czosel]

This would help with checking if a MultipleChoice question has at least one of the given options checked, which is a common use-case:

"my-multiple-choice-question"|answer intersects ["answer-a", "answer-b"]

JS Implementation:

questionJexl.addBinaryOp("intersects", 20, (left, right) => left.find(val => right.includes(val)))

[czosel]

/cc @winged @kaldras

[winged]

I like the idea! However the JS implementation is a bit buggy - what if we're dealing with a falsy value so the intersects operator "succeeds" but then returns the falsy bit? some() seems to be better suited.

questionJexl.addBinaryOp("intersects", 20, (left, right) => left.some(val => right.includes(val)))

[czosel]

Absolutely, good catch! I've hacked this line in a bit of a rush yesterday 😉