split static method
Split lines into individual lines.
If start and end are provided, only split the contents of
lines.substring(start, end). The start and end values must
specify a valid sub-range of lines
(0 <= start <= end <= lines.length).
Implementation
static Iterable<String> split(String lines, [int start = 0, int? end]) {
end = RangeError.checkValidRange(start, end, lines.length);
return _LineSplitIterable(lines, start, end);
}