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let s:S = vital#vital#import('Data.String')
let s:L = vital#vital#import('Data.List')
function! s:count_words(text) abort
let F = { memo, x -> has_key(memo, x)
\ ? extend(memo, {x: memo[x] + 1})
\ : extend(memo, {x: 1})}
return s:L.foldl(F, {}, s:S.scan(a:text, '\w\+'))
endfunction
echo s:count_words('this is a pen or not a pen')
" {'this': 1, 'is': 1, 'a': 2, 'pen': 2, ...}
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