The primary application for this function is the definition of the namedSlices value in the options map passed to the [Related] method on the Pages object.
See related content.
{{ $kv := keyVals "foo" "a" "b" "c" }}
The resulting data structure is:
{
"Key": "foo",
"Values": [
"a",
"b",
"c"
]
}
To extract the key and values:
{{ $kv.Key }} → foo
{{ $kv.Values }} → [a b c]