The TrimLeft(s) command removes the leading whitespace from string s and returns the resulting terminal substring. If string s has no leading whitespace, then it is returned unchanged.

The TrimRight(s) command removes the trailing whitespace from string s and returns the resulting substring.  If string s has no trailing whitespace, then it is returned unchanged.

The TrimRight function is defined by .

The Trim(s) command is defined to be the composition .