Business
Jobs
  • About Us
  • Solutions
    • Job Postings
      Post your job and receive qualified candidates in 48h.
    • Candidate Assessments
      500+ technical and psychological tests, plus anti-fraud.
    • Headhunting
      Tailor-made executive search from start to finish.
    • Payroll + EOR
      Payroll dispersal and EOR across 15+ LATAM countries.
  • Pricing
  • Jobs

0

163
Views
Difference between "useState(() => JSON.parse(localStorage.getItem("count")));" and useState(JSON.parse(localStorage.getItem("count")));

//store the count in the localStorage // get the value from localStorage and set initial value to the count

// Solution one: JSON.parse will be called every single render

const [count, setCount] = useState(JSON.parse(localStorage.getItem("count")));

useEffect(() => {
    localStorage.setItem("count", JSON.stringify(count));
  }, [count]);

// Solution 2: initializer function of useState

const [count, setCount] = useState(() =>
    JSON.parse(localStorage.getItem("count"))
  );

useEffect(() => {
    localStorage.setItem("count", JSON.stringify(count));
  }, [count]);

My question: How come solution 2 will prevent code from calling JSON.parse every render?

Thanks

about 4 years ago · Juan Pablo Isaza
Answer question
Find remote jobs

Discover the new way to find a job!

Top jobs
Top job categories
Business
Post vacancy Pricing Sales
Legal
Terms and conditions Privacy policy
© 2026 PeakU Inc. All Rights Reserved.
Andres GPT
Show me some job opportunities
There's an error!