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Martin Atkins e7d71995f6 website: Document the remaining "collection" functions

This also renames some of the existing function pages whose source
filenames were not matching the usual naming scheme (.html.md).

2018-10-16 18:47:33 -07:00

layout, page_title, sidebar_current, description

layout	page_title	sidebar_current	description
functions	coalescelist function	docs-funcs-collection-coalescelist	The coalescelist function takes any number of list arguments and returns the first one that isn't empty.

`coalescelist` Function

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

Examples

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

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

> coalesce([[], ["c", "d"]]...)
[
  "c",
  "d",
]

coalesce performs a similar operation with string arguments rather than list arguments.