lev.iterator module

[hnakamur]

I propose lev.iterator module.
It can be used on tables too because tables are also iterators.

This is draft APIs.

iterator.keys(iter_func):table
iterator.values(iter_func):table

iterator.isEmpty(iter_func):boolean
iterator.count(iter_func):number

iterator.toTable(iter_func):table

iterator.select(iter_func, predicate_func):table

iterator.indexOf(iter_func, predicate_func):number
iterator.lastIndexOf(iter_func, predicate_func):number

iterator.any(iter_func, predicate_func):boolean
iterator.all(iter_func, predicate_func):boolean

[hnakamur]

I realized these APIs does not depend on lev, so these should be implemented as a separate library.

[kristate]

I think that this might be valuable to the language, so perhaps we can include it into lev. Instead of an iterator library, perhaps as an extension to tables