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Range Fun in Ruby
(-10..-5).include?(-7)
#=> true
(-5..-10).include?(-7)
#=> false
(10..5).include?(7)
#=> false
(5..10).include?(7)
#=> true
# OK, so maybe 10..5 wraps the whole set of integers?
(10..5).include?(3)
#=> false
(10..5).include?(11)
#=> false
# Nope...
// This shows why this is so
range_cover(VALUE range, VALUE val)
{
VALUE beg, end;
beg = RANGE_BEG(range);
end = RANGE_END(range);
if (r_le(beg, val)) {
if (EXCL(range)) {
if (r_lt(val, end))
return Qtrue;
}
else {
if (r_le(val, end))
return Qtrue;
}
}
return Qfalse;
}
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