Interview question to reverse string without inbuild function in javascript and typescript

const testStr = "Javascript is great language . I love javascript and React is a javascript framework.";

const reverseStr = (input) => {

 const wordArr = input.split(" ");

 const revArr = [];

 for(let i = wordArr.length - 1; i >= 0; i--){

   revArr.push(wordArr[i]); 

 }

 return revArr.join(" ");

}

console.log(reverseStr(testStr));