How to group and count the elements in array simply ?

[BubbleGarten]

have :

[1,2,2,3,3,3]

want:
{"1":1,"2":2,"3":"3"}

Possible Ways:
step1: use groupBy() , groupBy([1,2,2,3,3,3], #) here , got: {1:[1], 2:[2,2], 3:[3,3,3]}
step2: then map() ? but seems no way to built struct in expr-lang

[antonmedv]

Using groupBy can solve the problem.

I think we need to add countBy builtin. We already have count.

[BubbleGarten]

But I don't know how to do in step2 @antonmedv ,
the second argument in map() is expected to make a struct / json , but it's unsupported

trying my best: