Data.Counter

Documentation

type Counter k v = Map k v

The Counter type is an alias of Data.Map.Strict.Map.

empty :: Counter k v

Initialize a counter with no keys.

singleton

Arguments

:: Num v

=> k

Key to be inserted.

-> Counter k v

New counter.

Initialize a counter with a single instance of a key.

updateWith

Arguments

:: (Ord k, Num v)

=> k

Key to be inserted.

-> v

Specified frequency count.

-> Counter k v

Old counter.

-> Counter k v

New counter.

Increment the frequency count of a key with a specified value.

update

Arguments

:: (Ord k, Num v)

=> k

Key to be inserted.

-> Counter k v

Old counter.

-> Counter k v

New counter.

Increment the frequency count of a key by 1.

count

Arguments

:: (Ord k, Num v)

=> [k]

List of keys.

-> Counter k v

New counter.

Convert a list of items into a counter.

union

Arguments

:: (Ord k, Num v)

=> Counter k v

First counter.

-> Counter k v

Second counter.

-> Counter k v

Union of both counters.

Returns the union of two counters.