operator takeWhile.ts

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  import {Predicate, Seq} from 'fnxt/fnxt-types';
import {toSequence} from '../build';
 
export const takeWhile = <E>(predicate: Predicate<E>) => (seq: Seq<E>): Seq<E> =>
  toSequence(function* () {
    for (const e of seq) {
      if (predicate(e)) {
        yield e;
      } else {
        return;
      }
    }
  });