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?

What is not working? Or are you asking for the comments to be written in code? — Will P.
– Will P., Commented Dec 20, 2016 at 18:20
d[n] = [d[n], "additional value"]? You should provide inputs and expected outputs if you want a real answer. Also, you know jQuery has $.serializeArray(), right? — Heretic Monkey
– Heretic Monkey, Commented Dec 20, 2016 at 18:20
d[n] = [].concat(d[n],v) sames results if v is string or array — Malk
– Malk, Commented Dec 20, 2016 at 18:29

Alexander O'Mara · Accepted Answer · 2016-12-20 18:24:26Z

3

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);
    }
}

answered Dec 20, 2016 at 18:24

Alexander O'Mara

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