treyhuffine · March 5, 2019 00:56
diff --git a/usereffect-improper.ts b/usereffect-improper.ts
 function DelayedEffect(props: { timerMs: number }) {
  const { timerMs } = props;
  // ** BAD! ** setTimeout implicitly returns a number because the arrow function body isn't wrapped in curly braces
  useEffect(() => setTimeout(() => {/* do stuff */}, timerMs), [timerMs])
  // **
  return null
 }
	function DelayedEffect(props: { timerMs: number }) {
	const { timerMs } = props;
	// BAD! setTimeout implicitly returns a number because the arrow function body isn't wrapped in curly braces
	useEffect(() => setTimeout(() => {/* do stuff */}, timerMs), [timerMs])
	// **
	return null
	}
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