arr-to-map
create a map from items of an array, using one property as 'key'
collection-visit
Visit a method over the items in an object, or map visit over the objects in an array.
map-visit
Map `visit` over an array of objects.
array.prototype.flatmap
An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.
hasharray
A data structure that combines a hash and an array for fast dictionary lookup and traversal by complex keys.
