index/functions/splitClassKey.md

splitClassKey(key, delimiter): GalaChainTokenClassKey | undefined

Splits collection<d>category<d>type<d>additionalKey from the right, or undefined when there are fewer than four segments or any of the four is empty. The one place the split is written; the strict parseTokenClassKey calls it too.

The LAST three segments are always category, type and additionalKey; everything before them is the collection. Parsing from the right is required because real collections contain the $ delimiter themselves (for example $GMUSIC), so a plain left-to-right split('$') shifts every field.

Parameters

Parameter	Type
key	string
delimiter	"|" | "$"

Returns

GalaChainTokenClassKey | undefined