update localstorage value

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 var persons = JSON.parse(localStorage.persons);

for (var i = 0; i < persons.length; i++) {

   if(inputName === persons[i].name){  //look for match with name

       persons[i].age += 2;  //add two

       break;  //exit loop since you found the person

   }

}

localStorage.setItem("persons", JSON.stringify(persons));

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