Function ofCircularMutable

Returns a IMapOfMutableExtended that uses a ICircularArray to hold values. Mutable. This means that the number of values stored under each key will be limited to the defined capacity.

Required option:

• capacity: how many items to hold

Example: Only store the most recent three items per key

const map = ofCircularMutable({capacity: 3});
map.add(`hello`, [1, 2, 3, 4, 5]);
const hello = map.get(`hello`); // [3, 4, 5]
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