Module 03 Built-in Indexes

composable-indexes already comes with some built-in indexes. Here is a small summary, with links to the relevant documentation:

• BTreeIndex: An index useful for equality, range & maximum/minimum queries.
• HashIndex: The most performant index for equality queries.
• UniqueHashIndex: A hash index that enforces uniqueness.
• premap: A combinator that allows you to apply another index to a field of a value.
• group: A combinator that allows you to group values by a field, and apply another index to each group.
• FoldIndex: An aggregate index that allows you to build the index from a reducer function over the changes to the collection.
• algebraicGroupIndex: An aggregate index that is useful when the input forms an algebraic group.
• sumIndex: An aggregate index that sums the values of a field.
• arithmeticMeanIndex: An aggregate index that calculates the arithmetic mean of the values of a field.
• countIndex: An aggregate index that counts the number of values.