A map which be limited size of storage for catching.
Rin&Len store.
const RLStroe = require('rl-store');
const store = new RLStroe(1000); // Limite the store only retain 1000 length of string.
// to set
store.data['key1'] = 'value2';
store.dispatch('set', {key: 'key'});
// to get
let value1 = store.data['key1'];
store.dispatch('get', {key: 'key'});
// to remove a key maunally
store.delete('key1');