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import gleam/iterator.{Iterator} as iter
pub fn length(iterator: Iterator(a)) -> Int {
iterator
|> iter.fold(from: 0, with: fn(c, _) { c + 1 })
}
pub fn count(iterator: Iterator(a), satisfying predicate: fn(a) -> Bool) -> Int {
iterator
|> iter.filter(for: predicate)
|> length
}
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