Add ability to insert/delete elements to collections in MuranoPL

Registered by Stan Lagun

MuranoPL supports variable assignment but currently there is no way to insert/append/delete entries to lists from within workflows

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Stan Lagun
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Stan Lagun

I believe that the best solution for MuranoPL would be to have immutable collections.
$a: $a + $b instead of $a.append(): $b. This fits well into overall design and make language cleaner and fits well with functional languages' approach.
So what is needed to implemented is several helper methods in YAQL (head, tail, sublist, except and so on) and remove ability to modify lists using index ($x[0]: 123)

(?)

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