RangeIndex

Minimalistic helper for simple operation: put a bunch of [from, to] values and get any selection of them

API

put(from: integer, to: integer, record: Object): RangeIndex - put record to the index

find(from: integer, to: integer, options: Object?): Array - find records in range of from-to

findOuter(innerFrom: integer, innerTo: integer, options: Object?): Array - find records which from-to range contains innerFrom-innerTo range

Note: the result of findOuter is unsorted list of records. The records in this result would be in a different order than they were put. Specify the options.sort to sort result.

options = {
    sort: function(Object.<from, to>, Object.<from, to>){} // For findOuter method only. Callback for sorting result
    filter: function(record: Object, from: number, to: number){} // Callback for filtering result
}

Example

const rangeIndex = new RangeIndex()
    , dataset = [
        {from: 0, to: 10, data: '0-10'}, {from: 0, to: 20, data: '0-20'}, {from: 0, to: 50, data: '0-50'}
        , {from: 50, to: 100, data: '50-100'}, {from: 50, to: 120, data: '50-120'}, {from: 50, to: 150, data: '50-150'}
        , {from: 150, to: 1000, data: '150-1000'}
        , {from: 250, to: 1200, data: '250-1200'}
        , {from: 350, to: 2000, data: '350-2000'}
    ]
;
for ( let {from, to, data} of dataset ) {
    rangeIndex.put(from, to, data);
}
rangeIndex.find(0, 500);//["0-10", "0-20", "0-50", "50-100", "50-120", "50-150"]
rangeIndex.findOuter(300, 500);//["150-1000", "250-1200"]
 

Install

npm install rangeindex

License

MIT