adding an array into an array at a particular position (based on key value) in javascript

Question

I searched a lot, but I could not get a satisfactory answer on the net. In javascript, how do I add an array into another multidimensional array at a particular position based on a key value?

finalArray = []; //final result to be stored here
for(var i=0; i<5; ++i)
{
    var temp = [];
    for(var j in $scope.team[i])
    {
        // counter = some value calculated here
        temp[j] = $scope.team[i][j][counter];
    }
    finalArray[group[i]] = temp; // This gives an error
}

basically, I have

group = [ 'alpha' ,'beta', 'gamma' ]; //this array generated dynamically

my finalArray should be like,

finalArray['alpha'] = [ some records ];
finalArray['beta'] = [ some records ];
....

As far as I know, the way to add array into another array is to use .push() method, but that creates indices as 0, 1, 2... which is not desired. Please help me out

If you want named keys instead of numeric indexes, then you want to use a Javascript object, not an array. — jfriend00
– jfriend00, Commented Jun 10, 2015 at 9:23

akashrajkn · Accepted Answer · 2015-06-10 12:23:25Z

1

You have to use Object instead of Array. Make the following changes in the code

finalArray = {}; //final result to be stored here
for(var i=0; i<5; ++i)
{
    var temp = {};
    for(var j in $scope.team[i])
    {
        // counter = some value calculated here
        temp[j] = $scope.team[i][j][counter];
    }
    finalArray[group[i]] = temp;
}
console.log(finalArray); //to see the object key value structure

now you can reference the values in finalArray with group[i] name. Hope this helps

answered Jun 10, 2015 at 12:23

akashrajkn

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TheGr8_Nik · Accepted Answer · 2015-06-10 09:24:53Z

1

You have to define your finalArray variable as Object instead of and Array:

var finalArray = {}; //or better in your case finalMap

answered Jun 10, 2015 at 9:24

TheGr8_Nik

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Comments

ozil · Accepted Answer · 2015-06-10 09:28:37Z

1

var group = [ 'alpha' ,'beta', 'gamma' ];
var finalArray = {}; //declare it object as you dont want 0,1 indexes
for (var index in group){
    finalArray[group[index]] = "some records/arry of records"
}
console.log(finalArray);

DEMO

answered Jun 10, 2015 at 9:28

ozil

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1 Comment

TheGr8_Nik Over a year ago

you should check if ( gorup.hasOwnProperty(index) ) {...} to prevent undesidered behaviour.

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