21-apply-functional-programming-to-convert-strings-to-url-slugs.js

/*
Apply Functional Programming to Convert Strings to URL Slugs:
Fill in the urlSlug function so it converts a string title and returns the hyphenated version for the URL.
You can use any of the methods covered in this section, and don't use replace. Here are the requirements:
    The input is a string with spaces and title-cased words
    The output is a string with the spaces between words replaced by a hyphen (-)
    The output should be all lower-cased letters
    The output should not have any spaces

- Your code should not use the replace method for this challenge.
- urlSlug("Winter Is Coming") should return the string winter-is-coming.
- urlSlug(" Winter Is  Coming") should return the string winter-is-coming.
- urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone") should return the string a-mind-needs-books-like-a-sword-needs-a-whetstone.
- urlSlug("Hold The Door") should return the string hold-the-door.
*/
// Only changed code below this line
function urlSlug(title) {
    return title
        .trim()
        .split(/[\W]/)
        .filter(string => string.length > 0)
        .join("-")
        .toLowerCase();
}
// Only changed code above this line
console.log(urlSlug("A Mind Needs Books Like A Sword Needs A Whetstone"));
console.log(urlSlug("Winter Is Coming"));
console.log(urlSlug(" Winter Is  Coming"));
console.log(urlSlug("Hold The Door"));