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JavaScript

// Accessor
const entryAccessor = (array, index) => {
	return {
  	get value() { return array[index]; },
    set value(x) { array[index] = x; }
  }
};

// Example usage
const a = ["a", "b", "c"];
const e = entryAccessor(a, 0);
console.log(e.value); // "a"
e.value = "A";
console.log(e.value); // "A"