Python has a fantastic feature called slices
. It allows you to work with a list
, set
or string
by it’s index items.
E.g.:
string_sample = "hello world" string_sample[:-1] >>> "hello worl" string_sample[-1] >>> "d" string_sample[3] >>> "l"
You can also do things like:
string_sample[3:5] >>> 'lo'
Or even in reverse!
string_sample[::-1] >>> 'dlrow olleh'
A possible Java implementation
public String slice_start(String s, int startIndex) { if (startIndex < 0) startIndex = s.length() + startIndex; return s.substring(startIndex); } public String slice_end(String s, int endIndex) { if (endIndex < 0) endIndex = s.length() + endIndex; return s.substring(0, endIndex); } public String slice_range(String s, int startIndex, int endIndex) { if (startIndex < 0) startIndex = s.length() + startIndex; if (endIndex < 0) endIndex = s.length() + endIndex; return s.substring(startIndex, endIndex); }