check if localstorage key exists

//If the given key does not exist in the list associated with the object then this method must return null.

if (localStorage.getItem("infiniteScrollEnabled") === null) {
  //...
}

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Patricia Turnbull 130 points

                                    if(&quot;user&quot; in localStorage){
   alert('yes');
} else {
   alert('no');
}

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Thanks_in_advance 90 points

                                    if (localStorage.getItem(&quot;username&quot;) === null) {
  //...
}

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