Get index of key-value pair in OrderedMap

Is your feature request related to a problem? Please describe. I have such problem: I want to know how much values are between of two keys.
I have a timeline of thousands of events, and I use an OrderedMap (key is timestamp, value — event data), because I draw a line chart for them. I want to give a user an opportunity to know, how many events are between two chosen points.

Describe the solution you’d like If I’d have an index of an item, I could do this:

// eventMap is an OrderedMap
const leftIndex = eventMap.getIndexByKey(leftKey)
const rightIndex = eventMap.getIndexByKey(rightKey)
const eventsBetween = rightIndex - leftIndex - 1

Describe alternatives you’ve considered I could also have a simple method like OrderedMap.prototype.itemsBetweenKeys:

// eventMap is an OrderedMap
const eventsBetween = eventMap.itemsBetweenKeys(leftKey, rightKey)

[ZLY201]

@ZLY201 Thank you so much for that feature. It will make my experience of using your library so much better 🔥

Sorry, there’s a bug.

See https://github.com/js-sdsl/js-sdsl/issues/47.

We will fix it soon.

[ZLY201]

New version 4.1.5-beta.0 has been published with index enabled.

We will release the official version next week if no bug reports.