core : comparable
Comparable is a squish-in that uses the <=> operator for comparisons.
Usage
This squish-in relies on the object having a <=> function defined. This function should take a single argument and return -1, 0, or 1, if the object is less than, equal to, or greater than the argument, respectively.
first_letter = new
first_letter.init = { str | my.str = str }
first_letter.<=> = { s | s.str[0] <=> my.str[0] }
first_letter.squish comparable
a = first_letter.new "hello"
b = first_letter.new "world"
a <=> b #returns 1
a > b #true
a <= b # false
b > a #false
b == a #false