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showing results for - "usememo hook react"
Greta
10 Sep 2018
1
2const [a,setA]=useState(0);
3const [b,setB]=useState(0);
4
5const pow=(a)=>{
6  return Math.pow(a,2);
7}
8
9var val= useMemo(()=>{
10  return pow(a);  // calling pow function using useMemo hook
11},[a]); // only will be called once a will changed (for "a" we can maintain state)
12
13
14return(
15  
16   <input type="text" onChange={(e)=>{setA(e.target.value)}}>
17   <input type="text" onChange={(e)=>{setB(e.target.value)}}>
18  
19  
20
21  {val} // to access the value from useMemo
22)
23
24
25
26
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