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
Question
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
Solution
The "useEffect" hook in the given React code is dependent on the "age" state. This means it will be called every time the "age" state changes.
Initially, when the component mounts, "useEffect" is called once.
Then, each time the "Change Age" button is clicked, the "age" state is incremented by 1, triggering the "useEffect" hook.
However, clicking the "Change Name" button changes the "name" state but does not affect the "age" state, so it does not trigger the "useEffect" hook.
Given that each button is clicked 3 times, the "Change Age" button will trigger the "useEffect" hook 3 times.
So, in total, "useEffect" is called 4 times: once on mount and three times due to the "Change Age" button.
Therefore, "use Effect called" will be logged to the console 4 times.
Similar Questions
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
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
useEffect(()=>{ console.log(‘hello’)},[state1,state2]])Which statement is true for the above code?
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
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
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