String Indexes

A string is an ordered sequence of characters. Each character has a position or index. Take for example the word javascript:

characters:  j  a  v  a  s  c  r  i  p  t
indexes:     0  1  2  3  4  5  6  7  8  9

javascript has 10 characters. (I could verify: "javascript".length.) So why is the last index 9 and not 10? Because indexes are zero-based: the first index is ZERO.

Want to know what's at the 4th index of javascript?

"javascript"[4]; // s

Want to know the 7th letter -- that is, the letter at the 6th index -- in parachute?

"parachute"[6]; // u

No tests this time. But before you dash off to the next lesson, run the code to see string indexing in action.