This abstract provides consistent cross-target unicode support.
Returns the character code at position
index is negative or exceeds
null is returned.
len characters of
this String, starting at position
len is omitted, all characters from position
pos to the end of
this String are included.
pos is negative, its value is calculated from the end of
this.length + pos. If this yields a negative value, 0 is
If the calculated position +
this.length, the characters
from that position to the end of
this String are returned.
len is negative, the result is unspecified.