GetFieldByJsonTag returns the field name as a string from the json value supplied by the request query params.

GetLessFunc supplies the output function from the.

OrderedBy some description of the function.

SortBy from the request query get the sort parameters.

MultiSorter structure to hold input array and the rwquest query parameters converted see GetLessFunc.

LessFunc used by MultiSorter OrderedBy used to hold the seq of sort.