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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	coalesce function	docs-funcs-collection-coalesce-x	The coalesce function takes any number of string arguments and returns the first one that isn't empty.

`coalesce` Function

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

Examples

> coalesce("a", "b")
a
> coalesce("", "b")
b

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

> coalesce(["", "b"]...)
b

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