List Format

Write a function that takes an array of strings and returns a human-readable list formatted with commas and the word "and" before the last item. This is similar to how natural language lists are formatted in English.

For example:

• ["apple"] → "apple"
• ["apple", "banana"] → "apple and banana"
• ["apple", "banana", "cherry"] → "apple, banana and cherry"
• ["", "two", ""] → ", two and "

Example Inputs & Outputs

formatList([]) 
// → ""

formatList(["apple"]) 
// → "apple"

formatList(["apple", "banana"]) 
// → "apple and banana"

formatList(["apple", "banana", "cherry"]) 
// → "apple, banana and cherry"

formatList(["one", "two", "three", "four"]) 
// → "one, two, three and four"

Constraints & Edge Cases

• The input will always be an array of strings
• Return an empty string if the array is empty
• Handle 1-item, 2-item, and 3+ item cases correctly
• Items may include empty strings, but treat them as valid values