Convert existing JavaScript object string property to an array of strings?

Question

I am curious if it is possible to check if the object value exists and if it exists I want to check if it is a string or an array .

// var n is a dynamic variable that is retrieved from $(this)
var d = {};
if(typeof(d[n]) == "undefined"){
   d[n] = "value";

}else{
   if(typeof(d[n]) == "string"){
     //Convert string to array using its curent value plus an additional value

   }else{
     //Append value to array

   }
}

Currently I am using a loop to create an object for AJAX. I have a few of the same names for the data points similar to an input with the name="name[]" .

How can I accomplish this?

Answer 1

All you need to do is reassign the property to an array if a string ( d[n] = [d[n], newValue] ), or call Array#push if it's not.

var newValue = "testing123";

var d = {};
if(typeof d[n] == "undefined"){
    d[n] = "value";

}else{
    if(typeof d[n] == "string"){
        //Convert string to array using its current value plus an additional value
        d[n] = [d[n], newValue];
    }else{
        //Append value to array
        d[n].push(newValue);
    }
}