JS Comparison of strings - less than and greater than

Question

I am fairly confused about these conflicts outputs, even after researching about it.
alert("nine" < "seven");
Output: true
But why this statement below is false?
alert("less" < "greatgreat");
Output: false
Is it compared by length or alphabetic order of strings?

Answer 1

Comparing data of different types may give unexpected results.
When comparing two strings, it compares the strings alphabetically.
'n' comes before 's' hence true.
'l' comes after 'g' hence, false.

Answer 2

Thanks for clearing it up!