basic operations on objects and arrays

[razibus]

I have not found how to do basic operations on arrays and objects like :

• appending objects/arrays (with a fallback function argument to deal with duplicates)
• removing a list of keys to objects or a list based on key matching, or JSONPath
• the for loop cannot follow a list of hey/values pairs; two loops cannot be appended Without the basic structure manipulation, it narrows drastically the usage of the library. Functional programming may help but is overly complicated and not easily maintainable.

The * : . operator is rejected inside a function. It would have been useful to define it relatively to the current context to provide unmatched keys/values. For instance:

def make1(data)
{
"v1": number($data.v[0]),
  * : .
}

or

def make2(data)
{
"v1": number($data.v[0]),
  for($data)
     .key: .value
}

None are accepted. It would have been a great help to get a local semantic of the * : . operator relatively to the data variable.

[larsga]

I'd be happy to help you with this, but most of these questions are underspecified, so I need to ask you questions to clarify each. And with four (at least) questions in a single issue I fear this quickly gets messy.

Could I ask you to break this into the following issues?

• Appending objects/arrays
• Removing a list of keys
• For loop over key/pairs
• Appending two loops (I think this is a separate issue, but please clarify if not)
• Object matching ({ * : . }) relative to context

[larsga]

The object matching issue is easy to solve:

def make1(data)
  $data | {
"v1": number(.v[0]),
  * : .
}

The | sets the context node so that you can do object matching on it. The .v dot access is also relative to the context node.