event listener for functional component

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Valeria
29 Aug 2018
1import React, { useEffect } from 'react';
2
3const Component = (props) => {  
4  useEffect(() => {
5    window.addEventListener('scroll', handleScroll);
6  });
7  useEffect(() => {
8    return () => {
9      window.removeEventListener('scroll', handleScroll);
10    };
11  }, []);
12
13  function handleScroll() {
14    let scrollTop = window.scrollY;
15  }
16
17
18  return ()
19}
20
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