CODEWITHSUNDEEP
javascriptarrayssorting
Greg
Greg

Reputation: 197

Sort javascript array by multiple keys

I have an array of objects something like this

var itemArray = [
    {
        "name": "name1",
        "flag": true,
    },
    {
        "name": "name1",
        "flag": false,
    },
    {
        "name": "name2",
        "flag": false,
    },
    {
        "name": "name3",
        "flag": true,
    }        
];

I am already sorting this by the name key using the following:

var sortedItems = sortByKey(itemArray, "name");

function sortByKey(array, key) {
    return array.sort(function(a, b) {
        var x = a[key];
        var y = b[key];
        return ((x < y) ? -1 : ((x > y) ? 1 : 0));
});

How do i also sort it by the flag key alphabetically so the false flags appear before the true flags? (I can use a string instead of boolean on the flag property if this makes it simpler)

To clarify, what I am looking for is an array which would be returned like this for example:

[
    { name: "name_a", flag: false },
    { name: "name_a", flag: true },
    { name: "name_b", flag: false },
    { name: "name_b", flag: true},
    { name: "name_c", flag: true},
    { name: "name_d", flag: false},
]

Upvotes: 1

Views: 658

Answers (3)

Nina Scholz
Nina Scholz

Reputation: 386604

You could use a proper callback, sort first by flag and if equal then by name.

var itemArray = [{ "name": "name1", "flag": true, }, { "name": "name1", "flag": false, }, { "name": "name2", "flag": false, }, { "name": "name3", "flag": true, }];

itemArray.sort(function (a, b) {
    return a.name.localeCompare(b.name) || a.flag - b.flag;
}),

console.log(itemArray);

Upvotes: 1

Eduard Void
Eduard Void

Reputation: 2714

var sortedItems = sortByKey(itemArray, "name");

function sortByKey(array, key) {
    return array.sort(function(a, b) {
        if(a[key] == b[key]) {
          return (a['flag'] ? -1 : 1);
        } else {
          var x = a[key];
          var y = b[key];
          return x.localeCompare(y);
        }
});

Upvotes: 2

Eduard Void
Eduard Void

Reputation: 2714

var sortedItems = sortByKey(itemArray, "name");

    function sortByKey(array, key) {
        return array.sort(function(a, b) {
            if(a['flag'] == f['flag']) {
              var x = a[key];
              var y = b[key];
              return ((x < y) ? -1 : ((x > y) ? 1 : 0));
            } else {
              return (a['flag'] ? -1 : 1);
            }
    });

Upvotes: 1

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