UseEffect
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UseEffect

When we want to call an api or any side effects which are not naturally the content of the DOM then we use useEffect
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useEffect( callback , condition or controller);
call back is a function which is run when the condition is fulfilled , condition is the variable or the list of the variabels we define in an array
and the controller is the condition itself when we want to run the callback
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This function (useEffect) runs one time by default when the page loaded
Then it is not a good practice to call an api very frequently so we can pass an empty array in place of the condition ;