count-map-pmb

Extended version of the count-map module, providing range filter and easy conversions.

API

This module exports one constructor:

CountMapPmb(...args)

Which works the same as the constructor exported from the original count-map module, except the objects created have some additional methods:

.toDict([opt])

Return the entries as a plain object. Useful for converting the counts to JSON.

opt is an optional options object that supports these optional keys:

• empty: If set to something other than undefined, and the result would be empty, instead return this value.

.filter(decide)

Make a partial copy with only entries for which function decide invoked with arguments (val, key, map) returns a true-y value.

.rangeFilter(min, max)

Return a CountMapPmb with only the entries whose count is at least min and at most max.

• If min is null or undefined, it is treated as negative infinity.

• If max is null or undefined, it is treated as positive infinity.

• Example: .rangeFilter(2) implies max = undefined and thus will report all entries that appeared at least twice.

.rangesFilter(ranges)

Multiple acceptable ranges can be given as an array of [min, max] pairs. Reports entries that match at least one range.

• Example: .rangesFilter([ [null, 1], [3, null] ]) will report all entries except those who appeared exactly twice.

Usage

see test/usage.js:

Known issues

• Needs more/better tests and docs.

 

License

ISC