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The addition of a class can be achieved through the utilization of an if-else statement by checking a certain condition and adding the class if the condition is met. Here is an example:

if (condition) {
   element.classList.add('new-class');
} else {
   // do something else
}

In this example, if the condition is true, the class "new-class" will be added to the element. Otherwise, the if-else statement allows for other actions to be taken.