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coalescelist Function

coalescelist takes any number of list arguments and returns the first one that isn't empty.

Examples​

> coalescelist(["a", "b"], ["c", "d"])
[
  "a",
  "b",
]
> coalescelist([], ["c", "d"])
[
  "c",
  "d",
]

To perform the coalescelist operation with a list of lists, use the ... symbol to expand the outer list as arguments:

> coalescelist([[], ["c", "d"]]...)
[
  "c",
  "d",
]
  • coalesce performs a similar operation with string arguments rather than list arguments.