time-limited-map-set

Extend Map and Set standard build-in objects, with the options for the collection items to be automatically removed after a period of time.

TimeLimitedMap and TimeLimitedSet inherit all methods of Map and Set standard build-in objects.

Examples:

1const map = new TimeLimitedMap(1000, (k, v, insertedMts) => console.log(k))
2
3// add a new pair to the map
4// it will be automatically removed after 1000 milliseconds and the callback function will be called 
5map.set('key', 'value')
6
7const set = new TimeLimitedSet(500)
8
9// add a new item to the set
10// it will be automatically removed after 500 milliseconds 
11set.add('item')
12
13// add a new item to the set, which will not be removed automatically
14set.add('item2', false)

Constructor

new TimeLimitedMap([expiryMs] [, callback] [, iterable])

new TimeLimitedSet([expiryMs] [, callback] [, iterable])

Optional parameters can be passed to the constructor:

• expiryMs - Indicates the duration in milliseconds after which the items are automatically removed from the collection. If undefined items are not removed from the collection.
• callback - Function to be called when an expired item is removed from the collection. The function is called with parameters key, value (only for TimeLimitedMap) and mts (inserted millisecond-timestamp).
• iterable - As for the Map and Set build-in objects, an iterable whose elements are added to the collection.

Methods

TimeLimitedMap and TimeLimitedSet inherit all methods of Map and Set standard build-in objects.

Changed methods:

set(key, value, [expire = true])

• expire - Additional optional parameter. Indicates whether the item should or should not be removed after expiryMs period has passed. Default is true.

add(value, [expire = true])

• expire - Additional optional parameter. Indicates whether the item should or should not be removed after expiryMs period has passed. Default is true.

New Methods:

getExpiryMts(key)

Returns expiry millisecond-time of a particular item in the collection.