linq.js groupby with Json

Question

This is my Json Object in simplified form.

 var jsonObject =
    [
        {"City":"Monroe","Country":"USA","Latitude":47.8524,"Longitude":-121.98151},
        {"City":"Austin","Country":"USA","Latitude":30.40137,"Longitude":-97.73542},
        {"City":"Austin","Country":"USA","Latitude":30.32198,"Longitude":-97.70864}
    ]

I want to groupBy using City and get the count of records belonging to a specific city, The code that I've tried so far is

    var query2 = $.Enumerable.From(jsonObject)
.GroupBy(
function(record) {return record.City},

function(record) {
        return {City: record.City}
    },
function(rec) {
        return {City:rec}
    }
).ToArray();

I'm still not able to get what i'm doing wrong here. i'm new to linq.js...any help would be appretiated, or atleast point me at right direction.

Answer 1

So you just wanted to get the count of cities? Try this instead:

var query = Enumerable.From(jsonObject)
    .GroupBy(
        "$.City",
        null,
        "{ City: $, Count: $$.Count() }") // $: Key, $$: Group
    .ToArray();