Returns the length of the nth
whitespace-delimited word in the receiving
string or 0 if the receiving string has fewer
than n words.
The n must be a positive whole number.
Example 5.136. String class — wordLength method
"Now is the time"~wordLength(2)--> 2"Now comes the time"~wordLength(2)--> 5"Now is the time"~wordLength(6)--> 0
