javascript ordering elements in array of objects

Question

I have the following array:

    [{"cod_nivel":"INC2","cod_modelo":"D"},
    {"cod_nivel":"INC2","cod_modelo":"B"},    
    {"cod_nivel":"PRIM","cod_modelo":"B"},    
    {"cod_nivel":"PRIM","cod_modelo":"D"},
    {"cod_nivel":"PRIM2","cod_modelo":"B"},    
    {"cod_nivel":"PRIM2","cod_modelo":"D"},    
    {"cod_nivel":"PRIM2","cod_modelo":"A"}]

I need to order this array of objects by "cod_modelo" ascending grouped by "cod_nivel". So the result should be:

    [{"cod_nivel":"INC2","cod_modelo":"B"},
    {"cod_nivel":"INC2","cod_modelo":"D"},    
    {"cod_nivel":"PRIM","cod_modelo":"B"},    
    {"cod_nivel":"PRIM","cod_modelo":"D"},
    {"cod_nivel":"PRIM2","cod_modelo":"A"},    
    {"cod_nivel":"PRIM2","cod_modelo":"B"},    
    {"cod_nivel":"PRIM2","cod_modelo":"D"}]

My attemp:

var array = [{"cod_nivel":"INC2","cod_modelo":"D"},
        {"cod_nivel":"INC2","cod_modelo":"B"},    
        {"cod_nivel":"PRIM","cod_modelo":"B"},    
        {"cod_nivel":"PRIM","cod_modelo":"D"},
        {"cod_nivel":"PRIM2","cod_modelo":"B"},    
        {"cod_nivel":"PRIM2","cod_modelo":"D"},    
        {"cod_nivel":"PRIM2","cod_modelo":"A"}];
  var groups = {}; // I know i need some temp object to store the current level that is being ordered..
    for (var i = 0; i < array.length; i++) {
         groups.push(array[i]);
    }

Rick Hitchcock · Accepted Answer · 2015-04-10 10:36:52Z

5

The sort method will do the work for you.

This code sorts the array, first by cod_nivel, then by cod_modelo.

The conditional operator:

condition ? expr1 : expr2

… is used to compare the array's elements by key. (The conditional operator is often called the "ternary operator" because it's the only JavaScript operator that takes three operands.)

var arr= [{"cod_nivel":"INC2","cod_modelo":"D"},
          {"cod_nivel":"INC2","cod_modelo":"B"},    
          {"cod_nivel":"PRIM","cod_modelo":"B"},    
          {"cod_nivel":"PRIM","cod_modelo":"D"},
          {"cod_nivel":"PRIM2","cod_modelo":"B"},    
          {"cod_nivel":"PRIM2","cod_modelo":"D"},    
          {"cod_nivel":"PRIM2","cod_modelo":"A"}
         ];

var sorted= arr.sort(function(a, b) {
  return a.cod_nivel  > b.cod_nivel  ? 1 :
         a.cod_nivel  < b.cod_nivel  ? -1 :
         a.cod_modelo > b.cod_modelo ? 1 :
         a.cod_modelo < b.cod_modelo ? -1 :
         0;
});

document.body.innerHTML= JSON.stringify(sorted).replace(/},/g,'},<br>');

edited Apr 10, 2015 at 10:36

answered Apr 10, 2015 at 10:21

Rick Hitchcock

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3 Comments

Grundy Over a year ago

methinks you need check cod_nivel first

Egidi Over a year ago

yes, but it is not grouped by cod_nivel after ordering it by cod_modelo. It needs to be grouped by cod_nivel (they need to be one after another the objects of same cod_nivel)

Rick Hitchcock Over a year ago

Sorry, I interpreted the question as needing to be sorted by cod_modelo first. I'll update.

ozil · Accepted Answer · 2015-04-10 10:22:28Z

2

var array = [{"cod_nivel":"INC2","cod_modelo":"D"},
    {"cod_nivel":"INC2","cod_modelo":"B"},    
    {"cod_nivel":"PRIM","cod_modelo":"B"},    
    {"cod_nivel":"PRIM","cod_modelo":"D"},
    {"cod_nivel":"PRIM2","cod_modelo":"B"},    
    {"cod_nivel":"PRIM2","cod_modelo":"D"},    
    {"cod_nivel":"PRIM2","cod_modelo":"A"}];


var sortedArray = array.sort(function(a,b) {
            return (a["cod_nivel"] > b["cod_nivel"]) ? 1 : -1;
    }).sort(function(a,b) {
            if(a["cod_nivel"] == b["cod_nivel"])
                return (a["cod_modelo"] > b["cod_modelo"]) ? 1 : -1;
            else 
                return 0;
    });
console.log(sortedArray);

demo

answered Apr 10, 2015 at 10:22

ozil

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Comments

Mayank · Accepted Answer · 2015-04-10 10:27:11Z

0

If there is no restriction of using a external javascript library, you can use Underscore js, this library is specifically designed for working with javascript objects and collections. you can take the following example for the solution

var stooges = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];

var sort = _.sortBy(stooges, 'name');

hope it helps ....

answered Apr 10, 2015 at 10:27

Mayank

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