Msg#: 4383571 posted 11:09 pm on Nov 4, 2011 (gmt 0)
Inside jQuery we've found several situations where we need to know if an argument is numeric, or would be successfully converted to a number if it is some other type. We decided to write and document jQuery.isNumeric() since it's a useful utility. Pass it an argument of any type and it returns true or false as appropriate.
In light of this they also removed the undocumented jQuery.isNaN().