Reverse words in a string

Given an input string s, reverse the order of the words.

A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.

Return a string of the words in reverse order concatenated by a single space.

Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.

const reverseWords = (input) => {
    let result = '';
    let word = '';
    let inWord = false;

    for (let i = 0; i < input.length; i++) {
        const char = input[i];

        if (char !== ' ') {
            word += char;
            inWord = true;
        } else if (inWord) {
            if (result !== '') {
                result = ' ' + result;
            }
            result = word + result;
            word = '';
            inWord = false;
        }
    }

    if (inWord) {
        if (result !== '') {
            result = ' ' + result;
        }
        result = word + result;
    }
    return result;
}