codeschool

/**

Concatenating a Mystery String

Concatenate the digits of 8 5 6 2 3 7 into a new String where:

All even digits (the actual number) are spelled in lowercase English
All odd digits (the actual number) stay as regular numbers
All values in the final string are separated by a space

*/

var temp = "";
"8 5 6 2 3 7".split(" ").forEach(function(n) {
  temp += ((n%2 == 0) ? ("two four six eight ten".split(" "))[n/2-1] : n) + " ";
});
temp.replace(/ $/, "");

I'd say I have used string concatenation ...

what i do