Reversing the order of words of a string in JavaScript

We are required to write a JavaScript function that takes in a string as the only argument.

The function should reverse the order of the words in the string and return the new string.

The only condition is that we cannot use the inbuilt array method reverse().

For example −

If the input string is −

const str = 'this is a string';

Then the output string should be −

const str = 'this is a string';

Example

Following is the code −

const str = 'this is a string';
const reverseWordOrder = (str = '') => {
   const strArr = str.split(' ');
   let temp = '';
   const { length } = strArr;
   for(let i = 0; i < length / 2; i++){
      temp = strArr[i];
      strArr[i] = strArr[length - 1 - i];
      strArr[length - 1 - i] = temp;
   };
   return strArr.join(' ');
};
console.log(reverseWordOrder(str));

Output

Following is the output on console −

this is a string
[
   [ 1, 0, 0, 0, 0 ],
   [ 0, 1, 0, 0, 0 ],
   [ 0, 0, 1, 0, 0 ],
   [ 0, 0, 0, 1, 0 ],
   [ 0, 0, 0, 0, 1 ]
]