A Map with an upsert method that is like a "get or set" method. Also supports gc'ing empty upserts.
npm install upsert-map
const UpsertMap = require('upsert-map')
const map = new UpsertMap(() => new Set(), set => !set.size)
map.upsert(10).add(1)
map.upsert(10).add(2)
console.log(...m.values()) // new Set(1, 2)
map.get(10).delete(1)
map.get(10).delete(1)
console.log(...m.values()) // <empty>
m = new UpsertMap(createValue, isEmpty)Make a new upsert map.
createValue(key) should return a value to be upserted for a key.isEmpty(val) can optionally be added for auto gc of empty values.val = m.upsert(key)Returns the value for key if already exists, otherwise it is created and inserted into the map.
val = m.get(key)Similar to Map.get
bool = m.has(key)Similar to Map.has
m.delete(key)Similar to Map.delete
size = m.sizeSimilar to Map.size
iterator = m.values()Similar to Map.values()
iterator = m.keys()Similar to Map.keys()
iterator = m[Symbol.iterator]()Similar to MapSymbol.iterator
MIT
FAQs
A Map with an upsert method and gc support
We found that upsert-map demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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