Array.prototype.reverse()

배열 순서를 반전해줌. ['1','2','3'] -> ['3','2','1']

const array1 = ['one', 'two', 'three'];

const reversed = array1.reverse();
console.log('reversed:', reversed);
// expected output: "reversed:" Array ["three", "two", "one"]

// 원본 array1도 변경함.
console.log('array1:', array1);
// expected output: "array1:" Array ["three", "two", "one"]

https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Array/reverse