I can not understand how to clear the whitespace in string

[lorenzoSpec]

Why this code can’t clear the whitespace on the left of the string. The challenge needs the string without any whitespace.

but I use trim() method.

// Only change code below this line
function urlSlug(title) {
return title.toLowerCase().trim().split(" ").join("-");
}
// Only change code above this line
console.log(urlSlug(" Winter Is Coming"));



//urlSlug(" Winter Is  Coming") should return the string winter-is-coming

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36.

Challenge: Apply Functional Programming to Convert Strings to URL Slugs

Link to the challenge:

freeCodeCamp.org

[kravmaguy]

@lorenzoSpec

return title.toLowerCase().trim().split(" ").join("-");

urlSlug(" Winter Is  Coming") should return the string winter-is-coming.

you are returning

winter-is--coming