Consider Sample component as shown below:const Sample = () => { const [age, setAge] = useState(0) useEffect(()=>{ console.log("use Effect called") }) return ( <> <h1>{age}</h1> <button onClick={()=>setAge(age+1)}>Change Age</button> </> )}export default Sample;How many times “use Effect called” will be logged to the console when the value of age is 77801
Question
Consider Sample component as shown below:const Sample = () => { const [age, setAge] = useState(0) useEffect(()=>{ console.log("use Effect called") }) return ( <> <h1>{age}</h1> <button onClick={()=>setAge(age+1)}>Change Age</button> </> )}export default Sample;How many times “use Effect called” will be logged to the console when the value of age is 77801
Solution
The useEffect hook in React runs after every render by default. In the given code, there is no dependency array provided to the useEffect hook, which means it will run after the initial render and then after every re-render caused by a state change.
When the component first mounts, "use Effect called" will be logged once. Then, each time the "Change Age" button is clicked, the age state is incremented by 1 and the component re-renders, causing "use Effect called" to be logged again.
So, if the age value is incremented one by one up to 77801, "use Effect called" will be logged 77802 times in total. This includes the initial render and each of the 77801 state changes.
Similar Questions
Consider the below code snippet:function Sample() { const [name,setName] = useState("Jack") const [age,setAge] = useState(20) useEffect(()=>{ console.log("use Effect called") },[age]) return ( <div> <h1>Your Name is: {name}</h1><br/> <h1>Your Age is: {age} </h1><br/> <button onClick={()=>setName("Tom")}>Change Name</button> <button onClick={()=>setAge(age+1)}>Change Age</button> </div> );}How many times the "use Effect called" will be logged to the console when the change Name button and Change Age button is clicked 3 times each?6745
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Choose the correct statements about the below code: const [name,setName]= useState('') const [age,setAge] = useState(0) useEffect(()=>{ console.log("useEffect method called") },[age]) useEffect will be called whenever name and age state changes useEffect is invoked once after initial render and then everytime when age state changes useEffect is invoked once once after initial render useEffect is not invoked
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
useEffect(()=>{ console.log(‘hello’)},[state1,state2]])Which statement is true for the above code?
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