JSFiddle - React, Tailwind, and code Playground

JavaScript

let arr = [1, 2, 3, 4]

const reverseArray = array => {
    for (let i = 0; i < array.length / 2; i++) {
        [array[i], array[array.length - 1 - i]] = [
            array[array.length - 1 - i],
            array[i]
        ];
    }
    return array;
};

console.log(reverseArray(arr))