This is a simple implementation of a trie in Javascript.
A trie is a data structure that stores strings in a tree. It is fast and efficient to check if the string belong to the trie or not. Detailed info at http://wikipedia.org/wiki/Trie.
e - l - l - o
/
h - o - m - e
\
s - t
This data structure has a lot of applications: http://wikipedia.org/wiki/Trie
Open the test.html with a browser.