Getting top 10 Values in a JSON File [duplicate]

Question

This is an example of my JSON file.

[
    {"Variable":"Hello","Variable1":20}, {"Variable":"Hi","Variable1":30},
    {"Variable":"How","Variable1":40}, {"Variable":"Who","Variable1":50},
    {"Variable":"Where","Variable1":60}, {"Variable":"This","Variable1":100},
    {"Variable":"Pork","Variable1":10}, {"Variable":"Creep","Variable1":90},
    {"Variable":"Mega Creeps","Variable1":80}, {"Variable":"LOL","Variable1":0},
    {"Variable":"ROFL","Variable1":0}, {"Variable":"LMAO","Variable1":0},
    {"Variable":"POP","Variable1":0}, {"Variable":"LOVE","Variable1":0},
    {"Variable":"PICK","Variable1":0}, {"Variable":"WHIZ","Variable1":0},
    {"Variable":"BORED","Variable1":0}, {"Variable":"KILLAH","Variable1":0},
    {"Variable":"LOLLING","Variable1":0}, {"Variable":"HALOO  HALOO","Variable1":0}
]

How can I get only the Top 10 from highest Variable1 number to the least? But gonna be passing the JSON file as the same format.

Answer 1

First, parse the JSON into an array of Objects:

var data = JSON.parse(json);

Then combine sort and slice to achieve your goal:

var top10 = data.sort(function(a, b) { return a.Variable1 < b.Variable1 ? 1 : -1; })
                .slice(0, 10);

See Array.sort

Answer 2

You can do it with Alasql JavaScript library. It download json file, parse it, and run SQL statement on it. This is a sample how to take top 10 directly from JSON file:

<script src="alasql.min.js></script>
<script>
    alasql("SELECT TOP 10 * FROM JSON('mydata.json') ORDER BY Variable1 DESC",[], function(top10){
        console.log(top10);
    });
</script>

Or if you already have data in memory:

    var data = [{"Variable":"Hello","Variable1":20},{"Variable":"Hi","Variable1":30}];
    var res = alasql("SELECT TOP 10 * FROM ? ORDER BY Variable1 DESC",[data]);

Try this sample in jsFiddle.