- history.push([...replacedArray, "=", result].join('').split(',')); // Used slice() at first. But slice() is not sufficient because it only creates a shallow copy of the array, and modifications to the new array will still affect the original array. The spread syntax ([...replacedArray]), which creates a shallow copy as well, is a concise way to create a new array with the same elements as the existing array. While ensuring that modifications to historyEntries do not affect replacedArray, and vice versa.
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