What is the syntax for the useEffect() hook in React, when you want to run a function inside the useEffect only when the app loads?AuseEffect(() => {}, []);BuseEffect(() => {}, [stateVariable]);CuseEffect(() => {});DAll of the above
Question
What is the syntax for the useEffect() hook in React, when you want to run a function inside the useEffect only when the app loads?AuseEffect(() => {}, []);BuseEffect(() => {}, [stateVariable]);CuseEffect(() => {});DAll of the above
Solution
The correct answer is A.
useEffect(() => {}, []);
This syntax for the useEffect() hook in React will run the function inside the useEffect only when the app loads. The empty array [] means that the effect has no dependencies, so it will only run once after the first render.
Option B, useEffect(() => {}, [stateVariable]);, will run the function inside the useEffect whenever the specified stateVariable changes.
Option C, useEffect(() => {});, will run the function inside the useEffect after every render.
So, only option A correctly specifies the syntax for running a function inside the useEffect only when the app loads.
Similar Questions
What is the purpose of the useEffect hook in React? a. To manage component state b. To create reusable logic in functional components c. To define the initial state of a component d. To handle side effects in functional components
Which of the following is an example of using the useEffect() hook to build a loader in a React component?AuseEffect(() => { setLoading(true); fetch('https://example.com/data') .then(res => res.json()) .then(data => { setData(data); setLoading(false); });}, []);BuseEffect(() => { setIsLoading(true); fetch('https://example.com/data') .then(res => res.json()) .then(data => { setData(data); setIsLoading(false); });}, []);CuseEffect(() => { setIsLoaded(false); fetch('https://example.com/data') .then(res => res.json()) .then(data => { setData(data); setIsLoaded(true); });}, []);DuseEffect(() => { setLoading(true); fetch('https://example.com/data') .then(res => res.json()) .then(data => { setData(data); setLoading(false); });}, [data]);
What does the useEffect hook do without a dependency array?
How to call the loading function with React useEffect hook only once?
The useEffect() method will run whenever any state of the component changes, when there is no second argument passed to it. Please validate the above statement. True False
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