pub fn counts(text: &str) -> HashMap<char, usize>Expand description
Returns a frequency map of the given text. The turned map maps characters to the number of
times they appear in the given string. To get a frequency map that maps characters to percentages,
use Frequency::of().
This function treats uppercase and lowercase as identical, and the returned map contains both for each character.
Use Frequency::cased_counts() to retrieve a map that’s case-sensitive.
§Performance
This is O(n).
§Returns
A map of characters and the number of times they appear in the given string.