reverse javascript

1"this is a test string".split("").reverse().join("");
2//"gnirts tset a si siht"
3
4// Or
5const reverse = str => [...str].reverse().join('');
6
7// Or
8const reverse = str => str.split('').reduce((rev, char)=> `${char}${rev}`, '');
9
10// Or
11const reverse = str => (str === '') ? '' : `${reverse(str.substr(1))}${str.charAt(0)}`;
12
13// Example
14reverse('hello world');     // 'dlrow olleh'

1var arr=[1,2,5,6,2]
2arr.reverse()

1var arr = [34, 234, 567, 4];
2print(arr);
3var new_arr = arr.reverse();
4print(new_arr);
5

1const array1 = [1,2,3,4];
2console.log('array1:', array1);
3//"array1:" Array [1, 2, 3, 4]
4
5const reversed = array1.reverse();
6console.log('reversed:', reversed);
7//"reversed:" Array [4, 3, 2, 1]
8
9// Careful: reverse is destructive -- it changes the original array.
10console.log('array1:', array1);
11//"array1:" Array [4, 3, 2, 1]

1array = [1 2, 3]
2reversed = array.reverse()

1var rev = arr.reverse();