uid() → String
Returns a unique id. The id starts with an "e" character and a randomly generated string of 32 alphanumeric characters.
Note: The characters the unique id is built from correspond to the hex number notation (from "0" to "9", from "a" to "f"). In other words, each id corresponds to an "e" followed by 16 8-bit numbers next to each other.
An unique id string.