Function to get JSON type

[gregsdennis]

This StackOverflow question needs the ability to isolate values of a given type. I think this would make a good function.

$.foo[?type(@)=='object']

The function would return a string (one of object, array, number, string, boolean, null) that indicates the value type of the parameter, which is a ValueType.

Not sure if true and false should be combined into boolean or not. Technically, these are merely tokens, not actual "boolean" values, though the association is strong.