Constructing of an array with objects

Question

I'd like to make an array how this:

var varOne, varTwo, varThree; // (If vars are == null don't insert on array)
var array = [];
array = [
    {"ONE": varOne},
    {"TWO": varTwo},
    {"THREE": varThree}
    ];

The inputs to the array I'd like to do only when varOne, varTwo and varThree are other than null

Best regards

I want to filter when the variables are null, for example, if varOne==null the array will be [{"TWO": varTwo},{"THREE": varThree}] — oscarvady
– oscarvady, Commented Sep 25, 2014 at 8:52

dfsq · Accepted Answer · 2014-09-25 08:52:49Z

1

Looks pretty natural to use if blocks for this:

if (varOne !== null) {
    array.push({ONE: varOne});
}

and so on.

answered Sep 25, 2014 at 8:52

dfsq

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Community · Accepted Answer · 2017-05-23 10:26:26Z

Just to add to dfsqs answer, you could create a function whichtakes any number of arguments and uses an iterator to perform a null check on each one. (ie use the arguments object - see JavaScript variable number of arguments to function) This code will give you an array of [{"1":"x"},{"2":"z"}]

function foo() {
 var array = [];
 var counter = 0;
 for (var i = 0; i < arguments.length; i++) {
    if (arguments[i]){ 
       counter++;
       var map = {};
       map[counter] = arguments[i]
       array.push(map);
        //document.write(i + " " + arguments[i] + " ");
    }   
 }
 return array;
}

var varOne="x"; 
var varTwo=null; 
var varThree="z"; // (If vars are == null don't insert on array)

var array = foo(varOne,varTwo,varThree); //could be as many variables as you like
//document.write(JSON.stringify(array));

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