Joining values in an Javascript array

Question

Say I have:

var Certificated = {}

Sub items are added dynamically and variate. Possible outcome:

var Certificated = {
    Elementary: ["foo","bar", "ball"]
    MiddleSchool: ["bar", "crampapydime"]
};

I want to do the following:

Certificated.Elementary = Certificated.Elementary.join("");

Except I need it to do that on all of the objects inside.

Keep in mind I can't know for sure the titles of nor how many objects will be inside Certificated.

My question is how can I use .join("") on all elements inside Certificated, without calling each one specifically?

EDIT: I am aware .join() is for arrays and the objects inside Certificated are going to be arrays. Therefore the join method.

JSON.stringify(Certificated)?

maerics
– maerics

2013-02-13 17:37:07 +00:00
Commented Feb 13, 2013 at 17:37 — maerics
– maerics, Commented Feb 13, 2013 at 17:37

Ian · Accepted Answer · 2013-02-13 17:40:35Z

2

Does this work?

for (var key in Certificated) {
    if (Certificated.hasOwnProperty(key)) {
        Certificated[key] = Certificated[key].join("");
    }
}

It loops through all properties of Certificated, and makes a quick safe check for the key being a real property, then uses bracket notation - [""] - to do your join.

Quick question - are you sure you want to use join? I know you just provided an example, but you can't call join on a string...it's for arrays. Just wanted to make sure you knew.

Here's a jsFiddle of my code working with arrays being used for the properties:

http://jsfiddle.net/v48dL/

Notice in the browser console, the properties' values are strings because the join combined them with "".

edited Feb 13, 2013 at 17:40

answered Feb 13, 2013 at 17:35

Ian

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2 Comments

Jonny Sooter Over a year ago

+1 for the key test! And yes, I updated my question to clarify that I planned to use the .join() on an array. I figured it was implied.

Ian Over a year ago

@JonnySooter Awesome, glad it helped. I thought you were implying, but I didn't want to assume too much. Nonetheless, I would've been glad to work with you if I hadn't understood :)

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