1 handleClick(event) {
2        event.persist();
3        this.setState((prevState) => ({
4            foo: prevState.foo + event.pageX
5        }));
6    }

1//Without event.persist() , 
2//React will make the first event value as null when second event is fired.
3
4//How to use?
5
6const handleFilterChange = (event) => {
7    event.persist();
8    setFilters(currentFilters => (
9      produce(currentFilters, draftFilter => {
10        draftFilter[event.target.name] = event.target.value;
11      })
12    ))
13  };