near_sdk/store/lookup_set/
impls.rs

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use super::LookupSet;
use crate::store::key::ToKey;
use borsh::BorshSerialize;

impl<T, H> Extend<T> for LookupSet<T, H>
where
    T: BorshSerialize,
    H: ToKey,
{
    fn extend<I>(&mut self, iter: I)
    where
        I: IntoIterator<Item = T>,
    {
        iter.into_iter().for_each(move |elem| {
            self.insert(elem);
        });
    }
}