Q: Using transform operator to delete variable keys

Hi,

I’m struggling to use the transform operator to delete a key without knowing its name (the string can’t be static in my use case). Is this possible? Can I use a @ context variable binding with transform operator in order to delete the matching element? Are there other alternative?

Here is my example where I’d want to delete any key/value object at any level in the hierarchy (the example is just one level) whose readOnly property is true.

Thanks, Fabrice

[lepinsk]

@andrew-coleman I found one edge case that I wanted to address here, in the event that someone else stumbles on this thread.

This will fail on any data structure that contains arrays within it, I believe because $each presumes it’s always operating on objects (Argument 1 of function "each" does not match function signature).

I’ve handled that case (I think) with the following modification (available to test here):

(
  $promote := function($obj) {
    $type($obj) = "array" ? (
        [$map($obj, $promote)]
    ) : (
        $each($obj, function($v,$k){
            {$k: ($v.targetKey ? $v.targetKey : $v[*] ? $promote($v) : $v)}
        }) ~> $merge()
    )
  };
  $promote($)
)

I’m using a $type conditional test to decide whether to iterate through the values using $map (in the case of an array), or proceed to $each as usual. (I’m enclosing the return from $map in square brackets to ensure that it doesn’t convert single-element arrays to objects.)

[lepinsk]

@andrew-coleman Incredible — thanks so much for this. (And for the great work on JSONata!)